Cordless Drill Battery Adapter

thingiverse

This adapter connects wires to a cordless drill battery; it's parameterizable, with further customization possible later. Key improvements include replacing pen springs with sprung plastic, calculating outer dimensions from inner ones, and reducing plastic usage via tower-like feet. To use, insert 4mmx15mm pen springs into holes, pass wires through springs, splay copper over spring ends, and place the adapter on the battery while holding springs out with fingers to secure wire contact.