MJ1 18650 battery pack 3S1P 4S1P 5S1P 6S1P 2S2P 3S2P 4S2P 5S2P 6S2P custom battery welding 7000mAh battery pack 7.4V to 25.2V

MJ1 18650 battery pack 3S1P 4S1P 5S1P 6S1P 2S2P 3S2P 4S2P 5S2P 6S2P custom battery welding 7000mAh battery pack 7.4V to 25.2V

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