![]() ![]() ![]() ![]() It contains substantial non standard advice, quite a lot of which goes against standard practice. BECAUSE: It is interesting and may be useful but should be treated with care. Do not fill with water or electrolyte above what can be readily absorbed by the mat.Īdded 2020: I have edited this post, removed some unrelated material and somewhat improved the formating. ![]() Adding 1 ounce of distilled water to each cell may help. Buy a Schumacher SC8 from Walmart for $80! It has an automatic desulfator cycle when necessary for almost dead batteries.ĪGM (AcidGlassMat) batteries are 'dry', with all the electrolyte absorbed into the mat, but may have dried out the mat too much from overcharging. Little 'advanced electronic chargers' costing a hundred dollars aren't worth their claims. A good machine warms up the battery in the process because of the voltage and current required. Most electronic charger/desulfators are a scam. I use $14,000 battery regenerators / desulfators. I do hundreds of deep cycle gel and AGM batteries a year. Shorted out cells in sealed case batteries cannot be repaired. You can remove the caps and measure each cell's voltage with a tester. If the battery drops below 10.5 volts after the floating surface charge is removed (wait three hours after disconnecting charger), you have a shorted out cell (electric short between plates). Is there anything I can do to try to revive this battery? Is there something like a desulfation or equalization charge that I could try to restore this battery, and how to do it to have the highest chance of success?Ī battery with 12.7 volts is fully charged, 12.5 volts is 90% charged. But in my case, the voltage dropped below 12V after only 10 hours - this is about 100 times less than what it should be. Then I disconnected the charger, and the voltage measured on the battery just after disconnecting the charger was 13.0V.Īnd then I placed a 60 mA load on the battery, which is a very tiny load for such a big battery, and it should go for about 40 days like this on an 80% full AGM deep-cycle battery before the voltage should drop below 12V. The voltage on the battery at the end of charging was 14.0V. This time (after these 10 days of 170 mA load), I did 20 hours of 2A charge (which should put about 33 Ah back into the battery). And then the battery was used for 10 days with a load of about 170 mA, so no more then 41 Ah should have been depleted from the battery. I don't know why it was so low, because the battery was charged previously only 10 days ago with 16 hours of about 5A charge, at the end of which the voltage on the battery (while still charged) was 14.7 V, and the specifications of CCCV charging of an AGM battery say that an AGM battery is at least 80% full when the voltage reaches 14.1 V, so 14.7 V should be really full. Up until recently it was working quite OK, I was able many times, for many months, to drain about 170 mA from the battery for a month before recharging it (such a drain should not deplete the battery below 20% full).īut recently the performance suddenly dropped, the last time I tried to charge it, here is what happens: the voltage on the battery without any load before starting to charge was 9.69 V. I have a AGM deep-cycle battery, 150 Ah, 12V: Banner "Stand By Bull" SBV12-150. ![]()
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