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lithium ion battery protection board, Amazon.com: Battery Protection Module, 14 Series Li Battery Cell BMS PCB Protection Balance Board Module TK14S40A-10M/V1 Applied to Rechargeable Lithium ion Battery, Lithium ion Polymer Battery : Electronics, Amazon.com: Protection Board 4S 30A 14.8V BMS 18650 Li-ion Lithium Battery Protection Board with Balance : Electronics