7.4V LiPo battery case for Lego with breadboard and space for regulators.
thingiverse
It can be placed inside a Lego design as the bottom is lego compatible. On top you can add a breadboard and there are 2 line of Lego pins to extend to Lego. In my case I used them to mount a Lego compatible micro:bit connector, available on aliexpress. The 7.4V 1100mAH battery is also from aliexpress. Inside I added two bucket regulators, one for 3.3V for the micro:bit and one for 5V for servo and motor power. I glued them there but with tinkercad it would be easy to add clips or anything to mount your own boards/regulators. There is a 12mm hole for a push on-off switch and a 3mm for a power indicator LED.
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