M5StickC External Battery Cap
thingiverse
This M5StickC Battery Cap was designed as a holder for a 400mAh extra Battery. The M5StickC is amazing in everything except the 80mAh internal battery that comes with it. I used the same screws they use in the ENV cap To simplify the PCB design, since it is just made to connect the battery's connectors to the BAT and GND pins, I printed the PCB in PLA so I could insert the connectors and solder a wire from behind. A simple yet powerful solution.
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