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DIY 3.2V LiFePO4 3.7V Li-ion Battery Pack 3s 4s 1A 2A Active Balancer, Find Details and Price about BMS Active Balancing BMS 4s from DIY 3.2V LiFePO4 3.7V Li-ion Battery Pack 3s 4s 1A 2A Active Balancer - Shenzhen Tuodatong Electronics Co., Ltd.