Battery tester
thingiverse
This is a battery-tester attachment for a Harbor Freight Cen-Tech muiltimeter (the one they give away from time to time). I love the fact that this tester tests batteries under load. These banana plugs are Chinese Ebay. I don't recall who I bought them from. You may need to improvise with a different plug. << I think these are the plugs: https://www.ebay.com/itm/10-Pack-4mm-Gold-Plated-Audio-Speaker-Wire-Cable-Screw-Banana-Plug-Connector/253642666573?hash=item3b0e47f24d:g:Kk4AAOSwKJ9bLxOt >> Hopefully, even if you cannot use this particular design, it will inspire you to create something even better. I am still pondering improvements. There is a remix of this (Rev B) at https://www.thingiverse.com/thing:3710762
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