Charging gel batteries with a simple tooth. Charging gel batteries with your own hands

The charger for gel batteries must meet certain requirements due to the special properties of this type of battery. First of all, the ban on the use applies to direct current devices. The easiest way to buy a universal device, due to its compatibility with many types of batteries.

More about application

battery device

First you need to figure out what gel batteries are. This separate view autonomous power supplies developed on the basis of GEL technology.

This group represents maintenance-free batteries, which are characterized by increased capacity. According to the set of properties, gel batteries are similar to counterparts produced using AGM technology, but outwardly they are similar to lead-acid versions.

The main difference between batteries based on GEL technology is the degree of viscosity of the medium in which the lead plates are placed - it is thicker. This is due to the presence of special additives in the electrolyte, which makes it possible to obtain a jelly-like gel. This type of battery maintains high current values in the circuit, and in addition, such batteries can work even if critical level discharge.

We watch the video, in detail about the purpose and application of gel models:

Given some differences, you should select a different type of charger to power gel batteries with certain characteristics. The key point in this case is the ability to change the amount of charge current, depending on how much the battery is discharged.

Main selection criteria

For long battery life, you need to select a charger with a certain set of characteristics, so as not only not to damage the battery, but also to help extend its service life. The following criteria are decisive:

Charge current range. To determine the normal level of this parameter, one must be guided by approximate calculations: 0.05-0.2C, which means a small part of the battery capacity (C), the units of which are A.h. If a car charger of various types for powering gel batteries operates at currents not higher than the minimum boundary of the announced interval (0.05C), then the battery charging process will take a very long time. In the reverse situation, when the battery is connected to a power source with an increased charge current, there is a high risk of its failure. The optimal values of this parameter for batteries of the GEL type are in the range of 0.15-0.2C.
The ability to adjust the charge current, which allows you to set the allowable limit of this parameter under the conditions of supplying a battery of a certain capacity. It is not recommended to connect a charger operating at a charging current exceeding the above limits, which will gradually lead to a reduction in battery life.
The battery voltage must match the type of charge. For example, there is a charger of various types for powering 12V or 24V gel batteries, and if a device is required to power a battery with a voltage of 6V or, for example, 48V, in this case it is possible to manufacture it to order.
temperature compensation. This function allows you to control the level of heating of the battery. Best Option is thermal compensation, the temperature sensor of which is remote for more accurate measurements.
The number of stages of the charging process, which implies a combination of cyclic and buffer modes, the first of which allows you to charge the battery first with constant current, then with constant voltage, and the second one maintains an already charged battery at a high level.
Permissible temperatures environment. It is usually recommended to use the device in the range from +5 ° C to +40 ° C.

If one more nuance: the charger for sealed lead gel batteries should be characterized by a lower charge voltage than in the case of liquid acid batteries. Otherwise, again, we can talk about the imminent failure of such a battery.

Overview of suitable models

Model Soyuz VS-2410A

The Soyuz VS-2410A variant, designed for 24V battery voltage, deserved high user ratings. Such a device functions cyclically: first, the primary charge mode is performed, which destroys sedimentary sulfation, as a result of which the battery acquires the ability to charge to the maximum level.

At this stage, the charging current increases gradually, then the maximum rated current is applied, and in the mode the device operates up to a charge level of 80%.

And at the end, charging is carried out by a current that gradually decreases. In total, the multi-type charger for powering 24V gel batteries of this type implements a 7-step process. The price of this model is 7,000 rubles.

A more expensive option (TSB Electronics) is Omnicharge 12-40, rated for 12V and 40A. Its price is about 34,000 rubles, and such a device is suitable for GEL, AGM and liquid acid batteries. This model has the ability to charge using 4 modes.

A much more affordable version is Orion Vympel-05, offered at a price of 900 rubles. Such a device is compatible with acid and gel batteries. Designed for 12V and 1.2A. Another Soyuz VS-1205A device (12V, 5A), its cost is 3,900 rubles, the number of stages in the charging process is 7.

The nuances of work

In the case of a built-in function that determines the battery voltage level, the device will automatically select the required operating mode. If there is a charge current regulator, a sufficient limit should be set to charge a specific battery. The value of this parameter should increase gradually: from the minimum to the maximum. If the low current mode is selected, then the charging process will be somewhat delayed, therefore, in order to eliminate the risk of heating, the charger is periodically turned off.

Watch the video, charging methods:

Some craftsmen prefer to assemble a charger for powering gel batteries with their own hands. To do this, you will need, among other things, a microcontroller, which allows you to better control the process of charging the battery. If desired, you can make the device turn off when the maximum charge level is reached, however, it is possible to implement the mode of constant recharging with low currents until the moment when it is reached. maximum value voltage. If the value of this parameter decreases, the charging process will resume.

The charger circuit for 12V gel batteries also provides for the presence of thermal compensation and a fan, which will be turned on using the controller directly in a situation where there is no temperature sensor. The device is controlled by changing the amount of charging current, which is affected by the resistance level. The device is turned on by pressing a button, then the battery charge level is determined, which determines the choice of a certain operating mode.

Thus, the type of battery determines the choice of execution of the charger. And for gel batteries, this is a task of paramount importance, given some design differences. In order not to spoil the battery by turning on the wrong charger, you need to pay attention to their compatibility.

I got the L200C chip and remembered how I assembled my first charger for gel sealed batteries. I grabbed a nastolgia and decided to repeat my work
The scheme is generally striking in its simplicity and reliability. For testing experiments, I will use the same battery as before, which, by the way, has been living with me for 6-7 years. I worked for 3 years in UPS and dried up, I restored the battery and spent the rest of the time feeding car amplifiers

A few words about the battery. The battery produces 12V 2.16A, weight is about 3kg. Their difference from car batteries in that they are filled with gel and they cannot boil, so they need special charging. That's it. Well let's get started

Scheme charger for sealed helium batteries

The circuit is powered from 5 to 40V, but it is better not to exceed 30V
Provides up to 32V stabilized voltage
Charge current up to 2A, but it is better not to exceed 1.5A
List of components

C1 = 100n any (ceramics, film)
C2 \u003d 3300mF We take the voltage higher than the power supply
C3 = up to 1mF any (ceramics, film)
R1 820 Ohm
VD1 depends on the charge current, but you can put any. With, for example, a charge of 0.5A, we set the diode to 1A

To set the desired charge voltage, you need to determine Rv. It is determined by the formula, based on Ohm's law, Rv \u003d Uo * R1 / (2.77-R1), where Uo is the charging voltage. R1 - from the diagram. In this case, 820 ohms, 2.77 is the reference voltage of 4 legs of the micro. For example, so that the charging voltage is 14.4V, this is the standard voltage for charging a 12V battery, we calculate Rv \u003d 14.4 * 0.82 / (2.77-0.82) \u003d 6.05K, it is better to take a trimming resistor of 5.7k + 0.47k to set the exact voltage

To set the maximum charging current, it is necessary to calculate the resistor Ri for the voltage drop between legs 5 and 2 for a voltage of 0.45V, we calculate Ri using the formula Ri = 0.45 / I, where I is the charge current. For example, a current of 0.5 amperes will be at Ri \u003d 0.45 / 0.5 \u003d 0.9 Ohm. Resistor power P=I^2*Ri. With a charge current of 0.5A, the power of the resistor is P \u003d 0.22W, but it is better to take 0.5W

Also, when universalizing charging for several voltages, it is better that the voltage difference between legs 1 and 2 is as small as possible, so you save on heatsinks for the microcircuit. If you plan to use charging at 6V and 12V, then it is better to take a transformer with a voltage of 15V with a tap from the midpoint at which 7.5V is under load. And when switching from 12V to 6V, switch the charging of the winding from 15V to 7.5V.

Speaking of the transformer. Its power depends on the charge voltage and charge current. If you plan to charge 1.5A current at a voltage of 14.4V, with a 15V secondary winding under load, then the trans power is needed from 40W 15V 2.5A, while charging takes 22W, and the rest is dissipated into heat on the radiator.

The voltage on the transformer can be taken more, but up to 30V. But at the same time, the radiator is good. At the same time, remember that after the bridge and the C2 filter, the voltage will rise 1.4 times more, so the trans can be taken with a voltage of up to 21V secondary

Well, on this I say goodbye to you. Happy assembly and good luck with the fix.

For safe, high-quality and reliable charging of all types of batteries, I recommend

In order not to miss the latest updates in the workshop, subscribe to updates in In contact with or Odnoklassniki, you can also subscribe to updates by e-mail in the column on the right

Do not want to delve into the routine of radio electronics? I recommend paying attention to the proposals of our Chinese friends. For a very reasonable price, you can buy pretty high-quality chargers

Simple charger with LED charging indicator, green battery is charging, red battery is charged.

There is short circuit protection and reverse polarity protection. Perfect for charging Moto batteries with a capacity of up to 20A\h, a 9A\h battery will charge in 7 hours, 20A\h in 16 hours. Price for this charger 403 rubles, delivery is free

This type of charger is able to automatically charge almost any type of car and motorcycle batteries 12V up to 80Ah. It has a unique charging method in three stages: 1. Constant current charging, 2. Constant voltage charging, 3. Trickle charging up to 100%.
There are two indicators on the front panel, the first indicates the voltage and percentage of charge, the second indicates the charging current.
Pretty high-quality device for home use, the price of everything 781.96 rubles, delivery is free. At the time of this writing number of orders 1392, grade 4.8 out of 5. europlug

Charger for a wide variety of types of batteries 12-24V with current up to 10A and peak current 12A. Able to charge Helium batteries and SA \ SA. The charging technology is the same as the previous one in three stages. The charger is capable of charging both in automatic mode and in manual mode. The panel has an LCD indicator indicating voltage, charge current and percentage of charge.

A good device if you need to charge all possible types of batteries of any capacity, up to 150A / h

Price for this miracle 1 625 rubles, delivery is free. At the time of this writing, the number orders 23, grade 4.7 out of 5. When ordering, do not forget to specify europlug

If a product has become unavailable, please write in the comment at the bottom of the page.
With uv. Admin check

Although the main segment of the automotive battery market is occupied by conventional acid batteries, more and more so-called gel batteries are appearing. The advantages of such batteries are much greater than those of the usual acid ones, they are less demanding in operation and maintenance. But everything is in order.

Design

So, the design of the gel battery differs little from the acid one. Inside there are sections, with packages of lead plates placed inside. Each of the packages consists of negative and positive plates. All packages are interconnected and two outputs come out of the case - “positive” and “negative”, to which the terminals of the automotive on-board network are connected.

But gel batteries are filled, unlike conventional acid batteries, with an electrolyte that is in a gel-like state, hence the name of the battery.

These batteries are completely maintenance-free, their case is completely sealed. Since the electrolyte is in the form of a gel, the battery can be positioned in any way, the electrolyte will stay on the plates and it will not flow when the battery is tilted or turned over.

Advantages

The electrolyte, which is in the form of a gel-like substance, will not leak out even if the case is damaged, which allows the battery to be used in the future, but not for a long time.

In addition, the evaporation process inside a gel battery is much lower than that of an acid battery, which made it possible to place the entire structure in a sealed enclosure. Vapors that form inside the battery are absorbed by the gel electrolyte and again participate in the reaction.

The main advantage of a gel battery is the provision of high starting currents, even when the battery is somewhat planted. It is indicated that it is able to provide high starting current even at a charge level of only 30% of the nominal. At the same time, such deep discharges for a gel battery are not as destructive as for an acid battery.

This battery also has a much lower self-discharge current. With a one-year downtime, it will lose no more than 10% of its charge. In addition, it can be stored even in a discharged state, without loss of performance. If necessary, it will be enough just to fully charge it to start using it further.

If you properly recharge this battery, then it practically does not lose its capacity. This provides it with the ability to withstand up to 700 charge-discharge cycles, which ensures a significant service life.

Another important advantage of gel batteries is their lower susceptibility to low temperatures. At such temperatures, the starting current, although reduced, but in lesser degree than conventional acid batteries.

disadvantages

All this makes it attractive to use this type of battery in cars. But they also have disadvantages. There are fewer of them than positive qualities, but they are also essential.

One of these is the cost of the battery. It will cost significantly more than acid, and although its life is longer, but improper operation and maintenance can significantly reduce the life of the battery.

And stress can shorten her “life”. This battery is very sensitive to voltage. The optimal voltage for it is 14.2-14.4 V. Exceeding this value will lead to flaking of the gel electrolyte from the plates, the transition of the gel to a gaseous state. Moreover, the amount of gas will be significant, and it will no longer be possible to convert it into a gel. This effect has already received the name "melting" of the gel. And given that voltage regulators on cars often do not have a specific meaning, but operate in the range of 13-16 V, the failure of such a battery is only a matter of time.

Although it is quite possible to use such a battery on a car, but only before purchasing such a battery, you should diagnose the on-board network and adjust the voltage regulator so that it does not produce more than 14 V.

Methods for charging gel batteries

This battery, although maintenance-free, is still required periodically. The frequency of recharging, if this battery is used on a car, depends on the period of its operation. It is recommended to recharge the gel battery no more than 1-2 times a year.

Something else useful for you:

Video: AGM and Gel battery. Charging gel and AGM batteries

For recharging, a special charger designed to work only with gel batteries must be used. Such devices will never even exceed the voltage, which can harm the battery. Some types of such devices perform recharging according to a certain algorithm, with a periodic change in current and voltage.

But such chargers are not yet common, and not all service stations take up charging gel batteries due to the lack of such devices at their disposal.

But at home, you can recharge the gel battery with a conventional charger. But apply automatic devices not recommended, since they regulate the voltage and current on their own, while during the charging process they can exceed the voltage above the value that is critical for such a battery.

But if the charger allows you to manually set the voltage and current strength, then it is quite possible to recharge the gel battery.

How to charge a gel battery with a charger

Before starting charging, be sure to set the voltage slightly below the value that is critical for the battery. This value is usually specified by the manufacturer and is approximately 14 V +/- 0.4 V.

Video: Charging a gel battery - how to charge!

You also need to correctly set the current strength. The optimal value is considered to be 10% of the nominal capacity of the gel battery. For example, the battery has a capacity of 60 Ah, which means that the charge current should not exceed 6 A.

It is also important to know the charging time.

But if there is time, then you can recharge with a current strength of 5% of the capacity. For the specified battery, when the parameter will be 3 A, and the recharging time will increase to 24 hours. But in this mode, the process will go better and the battery will fully accept the charge.

Be sure to follow the connection sequence. First, the charger clamps are connected to the battery terminals (it is important not to reverse the polarity), and then turn on the device. Periodically during the process, voltage and current parameters should be monitored.

It is strictly forbidden to prematurely stop charging. The fact is that such gel batteries have the so-called "memory effect". If in the process of interrupting recharging prematurely, for example, the battery was able to restore the charge only by 80%, then the next time it will not be able to take a charge more than these 80%. That is, from undercharging, the battery will lose part of its capacity and it will not be possible to restore it.

There is an opinion that maintenance-free gel batteries cannot be charged at all. Many experts present this fact as indisputable proof of not being a very successful purchase in the form of a gel battery for your car. In fact, things are different, because gel battery chargers have been around for a long time. In the US, for example, virtually the entire auto industry has switched from harmful acid batteries to products with greater environmental friendliness, long life and excellent charge retention. These are gel batteries, which today actively continue to spread in Russia. Of course, such devices have a lot of advantages.

Gel battery equipment is quite durable, as long as you do not exceed the loads and do not use the batteries at extremely high temperatures. But Russian frosts have no effect on these batteries. With the help of simple and well-known technologies for decades, manufacturers of AGM batteries have created devices that are quite suitable for use in our climate. Of course, such a technique is much more expensive than simple acid lead batteries, but it also lasts longer and causes much less problems.

Why is it impossible to charge a gel battery by simple charging directly?

If you have or have had such a battery with modern technologies, and you tried to connect a standard charger directly to a gel battery, you can safely throw away your failed battery. The fact is that when a certain level of current (which is perceived by lead batteries) is applied to the gel battery, the gel melts. Back in normal state the gel will never pass, and the remaining gel will begin to destroy even with slight heating. There are also the following problems:

when recharging on an almost fully charged battery, the gel does not melt, but the battery does not charge;
it is difficult to get the battery to get a charge, even if you have a custom launcher;
our charging equipment is designed for lead batteries, and such currents are deadly for gel;
gel batteries have certain specifics of the charging procedure that you need to know;
in our country there is very little information on how to use such batteries and why they are beneficial;
The battery cannot be heated, so when fully charged, you must turn off the power immediately.

If your gel battery starts to heat up while charging, you will most likely need to change the battery. The fact is that the battery loses its properties when heated, a liquid is formed inside, which will very quickly eat all the remaining gel. This is what happens when you connect a gel battery to a conventional charger - the internal environment of the battery heats up, the gel turns into water, destruction continues as soon as you install the battery on it workplace and start operation. After such a charge, the battery will invariably warm up, which already indicates its death.

How do special chargers for gel batteries work?

Many online stores and private steel sellers offer special chargers for gel batteries. These are devices that are not yet licensed for sale in our country, and therefore are not sold openly on store shelves. However, in some outlets you can already find a similar product. This special charger has several noticeable differences in operation compared to the usual version of the lead battery charger we are used to. The principle of operation of such equipment is quite simple, it includes the following stages of charging a gel battery:

turning on and measuring the current strength that the battery produces to select the optimal operating modes;
the beginning of charging at the required current strength indicators, which were determined automatically;
after a short period of time, a shutdown occurs to prevent the device from heating up;
then waiting for cooling down and switching on again at a different current strength for further charging;
in the intervals between turning off and turning on the charger, the current from the battery is measured;
if the current strength does not change, the device automatically turns off and does not perform further cycles;
when the measured current reaches the required values, the device automatically stops working.

The last step is very important. Most chargers do their job until they are unplugged. In the case of a charger for gel batteries, everything happens differently. If you continue to charge the battery after it has reached its optimum condition, the gel will begin to melt. These consequences have already been discussed above. Therefore, to charge gel batteries, it is better to use special customizable chargers that can restore even a very badly discharged battery. But there is another way to use regular charging and get the desired result.

How to charge a gel battery with a conventional charger?

To perform this procedure, we need a directly dead gel battery, another battery (you can take a gel, lead, new, old, used - it doesn’t matter), as well as a conventional charger. It is enough to connect everything in the correct order, as well as periodically check the progress of the process to get the desired result. This charging method is incredibly simple and it actually works - you can see it for yourself in your own garage by running necessary procedures charging. The procedure you need to follow in this case is as follows:

connect the charger to a lead battery or any other device chosen as an intermediary;
use next, connect the terminals of the rechargeable battery to the gel battery (plus to plus, and minus to minus);
wait two minutes and see if energy is being returned from charging to the batteries;
then touch the body of the gel battery (if the battery is already out of order, the body will noticeably heat up;
if the case is just warm, leave the batteries to charge for about two hours;
after this time, it is worth checking the temperature of the gel battery again, and also check it with an ammeter;
if necessary, charge for an additional one to two hours, and then unplug the entire system and remove the terminals.

You can easily get the necessary battery performance, if it has not already failed, using simple charging and an old battery of any type. In this case, the old battery acts as a transformer that takes over the entire charging load. The gel battery only takes a soft charge from the operation of the electrolyte in the old battery. This system works, which is proven by a certain number of videos and private experiments. Therefore, you can use a very simple gel battery recovery scheme and continue to use a convenient power source. We suggest watching a useful video with charging a gel battery below:

Summing up

The excellent ability to simply charge gel batteries by using a second battery of any type was first demonstrated by one of the world's most successful gel power companies. This caused a certain sensation among motorists, many were able to restore multi-year batteries that have already long years kept in garages just in case. The gel is durable and does not deteriorate from simple storage, so your old battery of this type can be easily restored too.

It's time to use the resource of car parts and accessories to the end, so it's worth learning how to charge a gel battery. This simple skill will help you significantly save battery life and extend its life. Via simple options charging can return the former work to the old source of energy for the car. Have you tried charging a gel battery by any means available?

Today, batteries based on gel electrolyte cannot be called a revolution in the industry, a revolution in the automotive industry or an innovation. Rather, this is a step towards the improvement of the equipment in question in order to increase the charge holding time, increase the technical parameters and operational life.

The principle of operation of the gel battery has not changed, since the acid filler and lead electrodes have not disappeared anywhere, but you have to think more seriously about how to charge the gel battery, since the traditional use of a conventional charger will only ruin the unit. What charging principles should be remembered, and which methods should be preferred?

Comparison of a gel battery with an acid battery: advantages and disadvantages

Gel batteries differ from acid batteries mainly only in the presence of silicon in the substance inside the unit. This element will make the fluid electrolyte jelly-like. This feature is relevant for scooters that change position while driving, therefore, it becomes necessary to provide more stable battery operation so that the gel structure connection does not come off the plates. The constant shaking of such vehicles is also the reason.

Studies have shown that slopes and vibrations contribute to the loss of a quarter of the charge in the case of a fully charged gel battery, when compared with normal driving.

Among the advantages it is worth highlighting the following:

toxic fumes are absent with careful and proper use;
even damage to the case will not cause the need to wipe the gel substance, moreover, the battery will continue to work;
no need for maintenance;
even an almost discharged battery shows good starting current;
it is permissible to leave the battery in the cold.

Along with the positive aspects, if there are negative sides.

The higher cost of gel batteries, however, the extended service life more than pays for this cost.
It is obligatory to control the values of current and voltage during charging. The problem is that these indicators are not always easy to determine, even if the bike is powerful.

More detailed information you can find out how to implement by reading the article of our author.

To know how to properly charge a gel battery, you should follow the features of its operation. The degree of charge should always be monitored with a multimeter. Simply turn off the transport device and connect the multimeter to the terminals.

It is necessary to monitor the so-called voltage threshold during recharging, this indicator should be in the range of 14.2 - 14.5 volts. The average voltage corresponds to about 14 volts, but it constantly fluctuates and never remains stable.

The less charge in the battery, the higher the current indicators will be, which will gradually decrease during recharging. One phenomenon is also associated with this feature: much more energy is consumed when the battery is discharged, despite the fact that the number of volts of voltage does not change.

If the voltage threshold is exceeded, the jelly-like gel will boil and turn into steam. Since gel batteries are not designed for refueling, it will not be possible to replenish the reserves of evaporated gel, moreover, this phenomenon may be accompanied by an explosion. Also, the gel can move away from the plates, and recovery will be impossible.

How to charge a gel battery with a regular charger

Efficient and safe charging of gel batteries with your own hands is possible even at home. The main requirement is to ensure the supply of direct current. Competent operation requires the refusal to use when the charge is low and the control of a fully charged battery. Also, do not leave gel batteries in a discharged state for a long time, since they have memory and capacity may decrease over time. So, why are conventional chargers not suitable and how to use them so that they do not harm the battery?

Why regular charging won't work

The answer to the question of whether it is possible to charge a gel battery with a conventional charger can be called ambiguous. On the one hand, connecting a conventional charger directly to such a battery will disable it without the possibility of recovery. The bottom line is that the gel melts onto the battery when a specific level of current is applied. The molten gel will no longer return to its original state, but will continue to melt the remaining substance.

The problems will also be:

the battery does not take a charge if the battery is almost fully charged, although the gel will not melt;
classic chargers are designed for operation with lead batteries, and for gel, such current strengths are detrimental;
gel batteries are very difficult to get to accept a charge, even with a customizable starting device;
the prohibition of heating requires immediate power off when fully charged;
the domestic information market does not have enough information about the use of gel batteries (in the USA they are the most common);
charging specifics differ from acid batteries;
if the battery still starts to warm up during charging, the battery will most likely have to be changed.

On the other hand, application right technology allows you to charge a gel battery with a conventional charger for an acid battery.

To learn how to charge a gel battery with a conventional charger, you need to additionally prepare a second battery, it can be old, used or new, gel or lead. You will also need a directly discharged gel battery and charger. The principle of safe charging in this case is based on the correct connection of devices in the required order.

The step by step procedure is as follows.

Connect the second additional battery to the charger.
Connect the intermediary battery terminals to the gel battery (minus to minus and plus to plus).
Wait a couple of minutes and see if the batteries get a charge.
Feel the case of the gel battery - it will be hot if the battery has failed. If the case is just warm, wait a couple of hours while the unit is charging.
Check case temperature again, also use an ammeter for additional reinsurance.
If necessary, continue to charge the battery for another hour or two and then unplug the system. At the final stage, remove the terminals.

An additional old battery in this case acts as a transformer, which takes on the entire load. The gel battery accepts soft charging, which is the result of the work of the electrolyte in the old battery.

For the first time, this experiment was carried out by one of the largest manufacturers of gel batteries, which caused real delight among car owners. For many, it has become affordable to restore batteries that have been gathering dust in the garage for many years. Gel does not deteriorate after long storage due to its durability, so even an old gel battery can be easily restored.

Using special chargers for gel batteries

It is also possible to charge the gel battery by using a special charger. In Russia, they are not yet licensed and they are often not found on sale, but you can find them if you wish.

Such special memory devices have a number of distinctive features, and the principle of operation is represented by the following stages of charging.

Turn on the battery and measure the current to determine the optimal mode of operation.
Start charging the battery at the indicators that were determined automatically.
Turn off the charge after a while so that the device does not heat up.
Wait until the battery cools down and turn on the charge again, but at a different amperage.
Do not forget to measure the current strength in the intervals when the battery cools down. If you do not change the current strength, charging is turned off automatically and further cycles do not continue.
As soon as the measured current meets the required parameters, the device will stop charging automatically.

Pay attention to the last step, since in most cases the memory will continue to work until the user disables it himself. In this case, the chargers have special settings that prevent the gel from melting when the battery overheats. It is possible to restore even the most discharged gel battery.

Requirements for special chargers

Since it is necessary to charge the gel battery of a car taking into account subtle features, chargers designed for this purpose must meet the following requirements.

Possibility to regulate the charge current.
Temperature compensation option taking into account battery heating. Charging conditions must change and adapt to the temperature of the battery itself and the temperature of the room.
The charging process should be staged, it is desirable to charge in three stages. In the first stage, the voltage increases, in the second, the voltage remains constant, and the current decreases. At the final stage, the charge must be maintained at minimum current and voltage values. The need for the last step is observed only if the battery needs to be stored and it will not be used.
Wide operating temperature range, optimal corridor from +5 to +40 degrees Celsius. An extended temperature range will be appropriate if you have to charge the battery in different temperature conditions at different times of the year.

How long to charge a gel battery

Do not charge gel batteries more than a couple of times a year. Always bring charging to completion, otherwise the capacity of the device will decrease during further operation, and it will be extremely difficult to restore this parameter to its original values. Perform calculations to determine how long the battery should be charged before full recovery of energy.

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