ELECFREAKS micro:bit Exclusive Crystal Battery Box (2 x AAA Batteries)
This is a battery box specialized for micro:bit. You can place two AAA batteries into the battery holder, switch on and then it will supply power to micro:bit via PH2.0 connector.
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For a bigger battery box, you can buy 2xAA Battery Holder with cover or 2xAA Battery Holder without Cover.
Micro:bit Power Solutions