18650 to double D battery adapter for torch
thingiverse
Replacing two D size batteries with one 18650 battery is now a possibility. To make this work, you need to add a strip of wire or thin metal at the bottom end to connect the negative terminal of the 18650 to the bottom of the holder. This is version 2 of the device. It was created using Tinkercad and can be edited online at https://www.tinkercad.com/things/e355Vic9wma
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