12 Volt A-23 Style Battery Box
thingiverse
It pretty much speaks for itself, really. I salvaged the battery contacts from a defunct solar light - the kind you'd find on a patio or garden, if you know what I mean. It was designed to take three AAA batteries, but its diameter and length were identical to what I needed. No modifications required, thanks to FreeCAD, which made the design process a breeze!
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