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LifePo4 Damage

New system I just am installing in van. Multiplus 3000 inverter/charger, two Lifepo4 12v batteries connected in series. Plugged into outlet with reverse polarity. Charger seems ok, but batteries go dead. when D/C load applied with charger off. The first battery, connected to positive side of circuit drops voltage to 7 v. Second battery connected in series on negative side of circuit has 14.3 v. Did I kill a battery or can it's BMS be reset?

battery charging
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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·
What batteries do you have exactly?
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snoobler avatar image snoobler commented ·
Not sure what happened, but 7V suggests the BMS has tripped as you suspect.


Did you fully charge the 12V both individually and in parallel before putting them in series?


Recommend you break the bank down and try to charge them individually as 12V and in parallel.

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