18650-35E lithium battery pack customized 7.4V~25.2V 3500mAh/7000mAh battery welding 2S1P-6S1P battery pack

18650-35E lithium battery pack customized 7.4V~25.2V 3500mAh/7000mAh battery welding 2S1P-6S1P battery pack

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