Reviving a Discharged AGM Gel Battery: From 8V to 13.6V and Back to 10V

Question

Last year, at the end of the motorcycle season, I installed a new AGM gel battery, unfortunately, for personal reasons, the moto went under the tarpaulin so that I did not remove the same battery for the winter. Now I took it out, voltage 8V, connected to the rectifier, it charged to 13.6V, which took him 2 days, after disconnecting the rectifier, the voltage dropped to 10V within a few hours and I don't want to land any more

Is there any more chance for him?

Zielonka · Accepted Answer

Hello I will worry my friend. Battery to be replaced. Regards WB

pawel16150 · Accepted Answer

Rather not, it remains to buy a new one.

_jta_ · Answer

It looks like sulphation - probably half a year has been discharged, did you charge it before winter? You can try to connect to 13.5V for a month (you do not need a lot of current) - it may start working. But maybe there will be more trouble with it than it is worth. How about the warranty conditions?

porlock · Answer

Before the winter, it was charged because it was new, maybe I started the engine 10 times, and the warranty covers such cases?

Anonymous · Answer

Have you loaded buddy, probably with some automatic contraption? What capacity? Has a colleague a voltmeter? (I think so) After the answer I will write what to do next. Regards .

porlock · Answer

Exactly an automagic structure by Lidl, the capacity is not great because it is a battery from an 8Ah motorcycle, I have a meter as much as possible, as well as a laboratory power supply which in theory can pull up to 5A at 32V

Anonymous · Answer

Plug in 10W bulb, discharge to 9.5V. Connect the laboratory power supply, controlling the current at the level of 0.8 A and charge to a voltage of 15.6 V. Repeat it. I revived more discharged. Regards

porlock · Answer

I will try, I have nothing to lose, how long the loading process to 15.6 may take, so more or less so that I do not get discouraged too soon and he did not come to the conclusion that probably nothing of it, in other words, when I have to forgive myself, previously until 13.6 it took 2 days.

Anonymous · Answer

With laboratory and overclocking (by increasing the voltage) the current to 0.8 A - up to 14 hours

porlock · Answer

Ok, thanks, let me know how it went.

_jta_ · Answer

If sulfation lasted six months, do not count on desulfurization for a dozen or so hours - too high voltage will result in gassing in some places, in other places it will leave sulfation.

kortyleski · Answer

If you have a laboratory power supply, set it in CC mode for about 50mA and leave the battery for a few days. Then discharge with a small current (e.g. a 12V1.2W bulb) and recharge. After a few such cycles, it should more or less come back to life

Anonymous · Answer

5 days will only be 6 Ah. Would I be wrong. Please expand. Regards . Aku has 8Ah.

kortyleski · Answer

Does not matter. It is about dissolving sulfur compounds in the electrolyte that have precipitated during deep discharge. Here you need a little electricity and a long time.

Anonymous · Answer

A little more than charged to rated capacity?

_jta_ · Answer

Much more time - the process of dissolving the "insoluble" lead sulphate crystals takes a long time.

Initially, the battery will accept a small charge - you can try to measure e.g. the charging time with a small (and always the same) current from e.g. 12.0V to 13.2V and check how this time changes - if it gets bigger, you can count on the fact that the battery takes more and more charge - its condition improves.

Reviving a Discharged AGM Gel Battery: From 8V to 13.6V and Back to 10V

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