There are a bunch of designs out there to help organize batteries for the Ryobi One+ 18V system. Some of them are really good, but they all seem to use a lot of filament to print. So I drew up some minimalistic battery holders, meant for mounting to a cabinet using double-sided foam sticky tape. They're easily remixed, though, if you need to add mounting holes for flat-head screws.
Two files are provided -- one each for a compact and high-capacity battery.