Seems my Yamaha PASB2 battery has to be replaced. The service manual reports an unrecoverable error (AFE fault). The battery has not used heavily (<100 charging cycles) so most probably the cells are still in good condition. I would try to replace the BMS board inside the battery with a new one and re-using the existing cells. Anyone has to sell this type of board ? Thanks in advance.
Yamaha PW unrecoverable error !
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