Should have been back to 100% within 15mins I'd have thought (mine only really stop accepting when they are virtually at 100% - not Fogstars though) Any chance one battery might be getting hotter or something silly like that?
It’s a classic internal resistance problem of cells in one of the batteries being higher. The power flows to the path of least resistance, hence one battery (the one with lower IT) charges much quicker, the BMS of the ‘better’ battery then says thanks I don’t need anymore charge and the higher IR battery then charges as quickly as the cells with the higher IR will allow.
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