SONY MD MZ-1 BP-MZ-1 battery adapter
thingiverse
This adapter enables you to use an 18650 battery instead of the original DB-MZ1 Ni-Cd battery. You'll also need to attach a metal plate on the "+" side to shorten the distance between the battery pin and the adapter, as the original BP-MZ1 battery pin is positioned more closely. Additionally, you can insert a piece of conductive gasket at the bottom of the battery adapter or if that's not feasible, solder it in place with wire to connect batteries in series (7.4v).
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