Mindstorms EV3 rechargeable battery holder
thingiverse
Based on this battery door model I designed a rechargeable battery holder for Mindstorms EV3. I ordered 7.4V LiPo batteries made for Syma RC Quadcopters. The high power wires shall be cut back and insulated. Use the charger ("balancer") connector instead for charging and loading as well. 7.4V shall be sufficient for the brick, according to some studies, it even works down to 5V. Supports are also part of the model, of course, shall be removed before using. Use glued copper sheets for terminals. TinkerCAD model is also shared here Good luck
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