Black and Decker 9019 screwdriver - Lithium Battery Replacement.

Changing out the old Nickel–cadmium batteries for an 18650 Lithium-ion one. The gearbox can be a real pain to put back together, trying to keep the parts in place, so best trying to keep it all together when taking apart. Charger modification to follow. Plus fitting a micro usb charging module to protect the battery.