Shabba Posted July 2, 2020 Share Posted July 2, 2020 Has anyone ever had a battery with a voltage reading too low to charge with the included charger? If so what did you do about it? Quote Link to comment Share on other sites More sharing options...
Chriull Posted July 2, 2020 Share Posted July 2, 2020 18 minutes ago, Shabba said: Has anyone ever had a battery with a voltage reading too low to charge with the included charger? If so what did you do about it? Unfortionately this comes quite often. Quote Link to comment Share on other sites More sharing options...
tudordewolf Posted July 2, 2020 Share Posted July 2, 2020 (edited) When the BMS is refusing a charge, it has a reason. In my experience, "battery too low to charge" actually means 1 dead cell, that the BMS is aware of, and preventing charging. The reduced voltage you're detecting is from the remaining good cells. The pack is worth more as individual salvaged cells and (maybe) a salvage bms now (often they'll be so taped up they're not reusable) now; even replacing the dead cell, you don't know how soon until its siblings start going bad too and what state of degradation they might be in. I've tried charging these packs by going straight to the connections on the battery, and it takes a charge, but the result is that you overcharge the good cells since they have to come up to the same voltage as they did before, and the pack is still useless (they'll all charge to 4.35 or 4.4, I've even seen 4.5 which is why the BMS is refusing a charge) Edited July 2, 2020 by tudordewolf Quote Link to comment Share on other sites More sharing options...
Chriull Posted July 2, 2020 Share Posted July 2, 2020 5 minutes ago, tudordewolf said: When the BMS is refusing a charge, it has a reason. Yes. But i'd start looking at the charger... Quote Link to comment Share on other sites More sharing options...
Shabba Posted July 2, 2020 Author Share Posted July 2, 2020 4 hours ago, Chriull said: Yes. But i'd start looking at the charger... The charger is charging my other batteries. I’ve had all three batteries out of the monster while I was waiting for a part from China, The voltage between the three batteries were pretty close but after sitting out of the monster for about 2 month Just one pack has drained all the way down to where it can’t be charged by the charger which I don’t understand why, the other two packs are pretty much at the same voltage Quote Link to comment Share on other sites More sharing options...
Chriull Posted July 3, 2020 Share Posted July 3, 2020 8 hours ago, Shabba said: The charger is charging my other batteries. To which voltage? 8 hours ago, Shabba said: I’ve had all three batteries out of the monster while I was waiting for a part from China, The voltage between the three batteries were pretty close but after sitting out of the monster for about 2 month Just one pack has drained all the way down To which voltage? 8 hours ago, Shabba said: to where it can’t be charged by the charger No red light? It stays green or no light at all? 8 hours ago, Shabba said: which I don’t understand why, Something bad with the wires? The BMS? Anything looks different, anything "abnormal" to be seen? 8 hours ago, Shabba said: the other two packs are pretty much at the same voltage Could be many dead cells, or some "physical" problems with the BMS, wires, cells, nickel strips or whatever of this pack... Quote Link to comment Share on other sites More sharing options...
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