bms

You'd need to check the manual for the battery or BMS to find out what the blinks mean, if there's a pattern or code.


Most likely it's just the balancing LEDs (if it has any) indicating that it's still balancing the battery.

It can take hours, days, or weeks, for any single charge session, depending on how bad an imbalance is and how low-current the BMS balancing is. Generally the charger should be left connected to it and plugged into the wall for the entire time, so it can correctly balance the battery.
 
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