This is the counterpart to my previous Adapter (https://www.thingiverse.com/thing:2830821) - it can be used to drive Einhell Power X-Change Tools with DIY battery packs. I personally prefer 5s2p packs of the Konion VTC4 18650 Cells as they are powerful, cheap and don't need any balancing at all (at least in my ebike battery packs which I use for more than 2 years).
This base version can be used for battery packs or for adapters to other batteries with 18V/20V (e.g. Makita, Dewalt, Ryobi, ...).
Print with support, 0.3mm PLA layers with 50% infill works fine for me. (The high infill value was chosen because I wanted to have a stronger lock "spring").