3S 25A BMS Li-ion 18650 BMS PCM battery protection 3S 60A BMS balanced Protection Charging Board 12v bms 12.6 to 11.1 lithium ion battery 3.7v BMS 18650 Li-ion Lithium Battery 3S 25A Li-ion 18650 BMS PCM Battery Protection Board Balance BMS 18650 Li-ion