Ti-58, Ti-59, Ti-59c battery backplate
thingiverse
This is a custom-made battery compartment cover for late 70's TI Calculators. It doesn't utilize the same latching mechanism as the original cover, so you may need to attach it in a different way. For my own calculator, I added a hole in the back to accommodate a larger battery, but I've also provided an unmodified version.
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