Walkman AAA Battery compartment (ultra compact)

thingiverse

A compact external battery pack for vintage Sony Walkmans and Minidisc Players from the late 90s and early 2000s. The original Walkman design, which utilized "gumstick" batteries, featured external contacts that accepted AA batteries through screw-on adapters. My design improves upon this concept by adapting it for AAA batteries while significantly reducing size (65mm x 17mm x 13mm) compared to the original adapter (71mm x 13mm x 22mm). Assembly is straightforward: simply attach two battery clips, one flat and one with a spring, each equipped with soldered stiff wires. The wires are then inserted through the left and right holes on the bottom of the pack, making contact with the Walkman's external battery connectors. Secure the battery compartment to the Walkman using an M2 screw through the middle hole. Alternatively, you can use a small zip tie (photo) to secure the battery in place.