tigerman Posted May 3, 2022 Share Posted May 3, 2022 Have 2 6s 40000 lipos and when I check the battery resistance 5 cells had a reading of between 3 and 7 but one cell had a reading of 57 I take it is time to replace these 2 battery. The second lipo had a reading of 5 cell again had a reading of 3 to 7 but again 1 cell had reading of 37 Quote Link to comment Share on other sites More sharing options...
Peter Jenkins Posted May 3, 2022 Share Posted May 3, 2022 Don't know about others, but I would replace a pack with such a gross mismatch in cell resistance. If you are using the pack to deliver its maximum rated current, the resistance of that one cell will drive the power loss in that cell causing it to heat up much more than the rest of the cells and could in the worst cause lead to cell failure and possibly a fire. Quote Link to comment Share on other sites More sharing options...
tigerman Posted May 3, 2022 Author Share Posted May 3, 2022 Thanks Think it is time to dump those 2 lipos then and replace them Quote Link to comment Share on other sites More sharing options...
Trevor Posted May 3, 2022 Share Posted May 3, 2022 If two batteries are suddenly reporting similar mismatched readings it sounds like you might have a fault with your charger or, more likely the balance board Quote Link to comment Share on other sites More sharing options...
tigerman Posted May 3, 2022 Author Share Posted May 3, 2022 I have tried it on 2 different chargers and get the same reading. To be on the safe side I will retire them. I need an excuse to try out some HRB Lipos ? Quote Link to comment Share on other sites More sharing options...
Phil Green Posted May 3, 2022 Share Posted May 3, 2022 If the 'bad' cell is an end one ie cell 1 or cell 6, you can easily modify it into a 5S pack. If its a middle cell, its a lot more work ? Quote Link to comment Share on other sites More sharing options...
PatMc Posted May 3, 2022 Share Posted May 3, 2022 1 hour ago, tigerman said: I have tried it on 2 different chargers and get the same reading. To be on the safe side I will retire them. I need an excuse to try out some HRB Lipos ? If it's the same position cell on both batteries it could be that one of the chargers is reading that particular balance position lower voltage than it really is causing the cell to be overcharged when attempting to balance it. This once happened to me, banjaxed 3 or 4 batteries before I realised the problem. 1 Quote Link to comment Share on other sites More sharing options...
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