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Why can't I charge My battery fully - read article and tested but!

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    Why can't I charge My battery fully - read article and tested but!

    I have a 36v main pack in a 4p10s configuration using 18650 cells. It charges to 42 volts exactly.
    I have a 36v get me home backup pack in a 2p10s configuration using 18650 3500 mah cells. It only charges to 41.2 volts using the same charger. But why?
    • The individual cells were tested at 4.2v +/- 0.1 volt before the pack was built.
    • The individual cells read 4.12v +/- 0.1 volt when the pack has been discharged below 41v and charged to the maximum.

    I've replaced the BMS and got the same results. Is it the BMS that is at fault and I'm just unlucky to have two bad ones? Or Is it something to do with the small size of the pack (2p10S)?
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