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4s1p 21700 14.8V 20A BMS Protection Board Electric Wheel Fish Wheel Lithium Battery, Find Details and Price about BMS Protection Board 21700 14.8V 20A BMS from 4s1p 21700 14.8V 20A BMS Protection Board Electric Wheel Fish Wheel Lithium Battery - Shenzhen Dragon Beauty Optoelectronic Co., Ltd.