2S1P 3S2P 4S1P~5S2P 6S2P MJ1 18650 battery pack custom MJ1 18650 battery welding 3500mAh / 7000mah battery pack 7.4V to 25.2v

2S1P 3S2P 4S1P~5S2P 6S2P MJ1 18650 battery pack custom MJ1 18650 battery welding 3500mAh / 7000mah battery pack 7.4V to 25.2v

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