Summary

AA battery pack that allows a USB (or other) permanent connection instead of batteries.

Instructions

This prints well without supports, tested with 3mm HIPS. Some battery compartments are a little tighter, so on my to-do list is a modified smaller version.

Strip a standard USB cable (or find a 3V power source, USB is 5V but generally tolerable for 3V devices), you want the red and the black cables. I soldered these onto standard car terminal connectors and then bent them around once in the battery pack. Working so far in powering an old 2x AA powered camera I can now have as a permanently powered camera.

USB powered AA battery pack