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AGM BATTERY WARRANTY

The slow discharge AGM batteries of any brand are built in a very basic way, there are no parts subject to wear or mechanical or electronic components.

In practice, it is a container with an acid inside, where lead plates wrapped in fabric are immersed, all under pressure with safety valves (VRLA).

We explain this to make it clear that a defect or failure, after the accumulator has been used for months or years, cannot be caused by the battery.

The only problem that can intervene is the so-called SULPHATION, that is the formation of lead sulphate crystals on the lead plates.

This is a natural chemical process in all batteries and should generally make a good battery last for at least three to four years as long as it is used correctly.

Misuse of the battery can speed up this natural process for various reasons, the most common being:

- Battery left discharged below the level of 10.8 Volts, at this voltage the chemical process immediately produces the formation of crystals;
- Battery used with inverter, with deep discharges. Slow discharge AGM batteries, as their name implies, are not designed for deep discharges but only with discharges determined by their class C.

For example, a 100Ah C20 must be discharged in 20 hours with an absorption of 5A (5A for 20 hours = 100Ah).

If you use the battery with a different absorption, a layer of crystals will be created on the plates with each improper use, and in the long run the battery will lose its charge capacity.

Same thing, charge the battery with chargers not designed for slow discharge AGMs, or with cheap or poorly configured photovoltaic regulators, because a wrong charging mode / curve will produce a small accumulation of crystals each time that in the long run will make the battery unusable.

In these cases the battery could also deform and swell due to the overheating of the electrolyte which, when boiling, irreparably damages the accumulator: the first advice in these cases is to check that the solar regulator and the battery charger are configured correctly for lead batteries. or AGM, and that the quality of these devices is not low (many solar regulators for a few euros unfortunately cannot guarantee correct charging)

We certainly did not create this information, a simple google search will confirm what we are saying:
https://www.google.com/search?q=sulfation+batteries+agm&uact=5&oq=sulfation+batteries+agm

So in summary, if the battery has worked well for months or years and then no longer works, maybe after one or two years, the "fault" will hardly be the battery but more likely its incorrect use over time.

Obviously, the manufacturers cannot guarantee the batteries in any case: if the use has not been that indicated in the product sheet, it will not be possible to obtain its replacement under the guarantee and this is easily ascertained in the laboratory by measuring the internal resistance of the battery: a simple test that declares the thickness of the sulphation and that will discover what was its use by the user.

If your AGM battery no longer holds a charge, you can attempt a recovery with a device called a "desulfator".

These devices produce high frequency pulses that could melt and decay the lead sulphate crystals deposited on the plates.
Obviously it will not be possible to restore the battery to its original state, but in many cases it is possible to recover it so that it can be used for some time.

The operation of the desulfator is simple, it is connected in parallel together with the battery charger on the poles of the battery itself, obviously paying attention to the polarity.
Once connected, it will start to send pulses and the battery will start charging.
24/48 hours are sufficient for a satisfactory desulfation cycle, but some batteries may require more desulfation cycles depending on the capacity and status of the battery as well as the power / quality of the desulfator itself.

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  •  19.03.2024 Giorgio Massa (PT) Italy

    Tutto perfetto grazie, [...]

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