18650-35E lithium battery pack customized 12V-21V 3500mAh/7000mAh battery welding 3S1P-6S1P battery pack screwdriver battery,

18650-35E lithium battery pack customized 12V-21V 3500mAh/7000mAh battery welding 3S1P-6S1P battery pack screwdriver battery,

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