square ends for headphone batteries

Headphone batteries no longer hold a charge? Having trouble finding replacements because someone put square ends on them? If you try to put regular AAA NiMH they won't turn on. Why the heck is that? Well there are tiny little switches at the negative end of the battery compartments that must be depressed. Print this object, cut it in half with diagonal cutters, then trim both pieces to fit (22mm in length). Shove the half-square end down to the bottom of the compartment and slid back to en