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Zero Motorcycles Forum | 2013+ / Re: Just bought a 2014 SR, Cell balance is 335-400millivolts
« on: January 09, 2023, 09:58:33 AM »
OK, so I can tell you right now the BMS does not have the oomph to balance that large of a delta in an individual cell. The charger doesn't matter, other than getting the SOC high enough, all the cells are connected together to the charger. The BMS has to do the balancing, more power won't help here.
Most of the time we have such a large imbalance in old batteries, it is due to irreversible battery cell aging. We got a lot of 13,14,15 batteries come in with a similar issues, and the only remedy Zero recommends is a battery replacement.
If that cell is aged, the ability to push or pull current into/from it is very different from its pals. If you did manage to charge it up, it would quickly revert to being imbalanced within a few rides at best. Sorry I don't have better news for you.
That being said, if you had the tools and engineering know how to isolate that cell, and trickle charge it to max, you could try it. But that's pretty squarely into dangerous waters for the untrained individual. This pack is more than capable of shocking you to death, or catching fire and burning down your house. Please be careful.
Most of the time we have such a large imbalance in old batteries, it is due to irreversible battery cell aging. We got a lot of 13,14,15 batteries come in with a similar issues, and the only remedy Zero recommends is a battery replacement.
If that cell is aged, the ability to push or pull current into/from it is very different from its pals. If you did manage to charge it up, it would quickly revert to being imbalanced within a few rides at best. Sorry I don't have better news for you.
That being said, if you had the tools and engineering know how to isolate that cell, and trickle charge it to max, you could try it. But that's pretty squarely into dangerous waters for the untrained individual. This pack is more than capable of shocking you to death, or catching fire and burning down your house. Please be careful.