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Thanks. That's exactly confirming my fear. So it's down to an external balance charger then.....

Many thanks for your comments. My issues with an embedded standard/generic BMS are the lack of control: I can't set the cell battery voltages. All that happens is a gross 42v (36v 10s/2p LiPo) is the point that the PSU brick cuts off. And in my situation any unbalance has 10 months between use...

Thanks again and I understand (and agree) your thoughts on the battery quality. A balanced 3.8v would be fine. If I used a smart BMS and got to that stage....and then left the battery for 6 months and the voltage spread was then, say 3.2 to 3.7v, should I expect a Neptune15 to rebalance (in one...

Hi and thanks for your answer. Sadly the battery is 3500 miles away so I can't do any testing. I was hoping to find out if smart BMS might do the job before I leave. If so, I would have to buy the BMS here before I leave UK (obviously no time soon!). A Neptune15, for example, would be quite an...

Q: will any BMS or smart BMS actively rebalance a substantially out of balance ebike battery? Background: I have a cheap Chinese ebike. It is at an overseas holiday home and is only used for 4-8 weeks per year. It is hard to imagine a less favourable ebike battery environment! The LiPo battery...

WARNING: this is not going to be conventional (and is not without danger)...... Short version/Spoiler: I connected the charger to the battery output in desperation and got the voltage up to the correct level over a period of about 12 hours....carefully monitoring the battery temperature and...