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battery magement system 14.8v, CentIoT - 4S 40A 14.8V 16.8V BMS Battery Management PCM PCB for 4 Packs Lithium Limn2O4 18650 Battery - with Balancer for Drill or Motors : Amazon.in: Electronics, 20A 14.8V BMS For 18650 Lithium Cells 4s 20a Battery Protection Board BMS Battery Management System module