Customizable Dummy Battery (AAA, AA, C, D, user defined)
thingiverse
AA, AAA, C, and D battery replacement (or create a custom size using the Customizer). Mofosyne created an easier to print version. Getting fed up with always empty batteries, I designed this product, inserted a low-cost Chinese 5V to 1.5V buck converter inside, and attached a USB-A connector to it. The source code is available at https://github.com/MuellerA/Thingiverse/tree/master/Battery. Update 2018-11-12: Added type D battery support. Update 2018-12-16: Updated dimensions as suggested by mofosyne. Update 2018-12-31: Modified wire hole positions, updated dimensions. Update 2019-11-16: Included a mount for zip ties.
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