Welch Allyn Battery adapter with charger
thingiverse
This is a Battery adapter to replace original welch allyn 72200 nickel cadmium battery for a 18650 standard litio battery. you will need a micro usb charger (easy find in ali express please find the same micro usb model ), M5 screw, and small wires. To assemble, please weld a wire to the negative pole battery. Positive wire no need to weld to battery, but please before to install the screw insert the positive wiret in a small hole close to top of adaptor (it is possible that this hole is closed afer print the adapter) (be sure that the wire reach the treath hole) to charge, you only need to conect it to a micro usb cell phone charger.
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