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12V 20A Lithium Battery Power Box (21700 Battery)

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I frequently DIY and often use 12v power sources. I made a battery box for convenient access to power.

Configuration: The charging and discharging uses a DC2.5 screw terminal, a boat switch, a 12v voltage and current meter, and a dual USB female connector.

The battery uses a 21700 lithium battery.

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