SOLVED: Identify faulty soldered PCB Lithium button cell replacement battery - Miscellaneous Electronics - iFixit
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3S BMS 25A 12.6V 4S 16.8V 5S 21V 18650 Li-ion Lithium Battery Protection Board Circuit Charging Module PCM Polymer Lipo Cell PCB QS-B405ANL-25A | QSKJ
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