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5 strings of 18.5V/21V18650 lithium battery protection board hand drill protection circuit board 18A working current 50A upper limit 5S-CMMT4540V5S -81031
5S 18.5V 21V 18650 Battery Circuit Charging Board Module Lipo PCB BMS for DC 5S 18.5V 21V 18650 Li-ion Lithium Bttery Protection Circuit Chrging Bord Module Lipo Cell PCM PCB BMS for DC Electric Drill
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