Battery terminal for Makita battery 18V.
Designed to fit the battery mount by GPlatek https://www.thingiverse.com/thing:352094
Redesigned / Remixed from https://www.thingiverse.com/thing:863257 so that it is much easier to create the metal contact (simple L shape, no bending metal required).
Metal contact made from 1mm metal, dimensions shown in the pic. Tab sized to fit electrical contacts like these https://www.amazon.com.au/gp/product/B09MFFW5YK/
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I made this to create a Makita battery powered dual USB charger (pictured as an example only, models not included yet) using these dual 5v converters https://www.amazon.com.au/gp/product/B07KWRH61D/
The author hasn't provided the model origin yet.