Ryobi 18V One+ to 40V Battery Adapter for Ryobi 40V Tools
thingiverse
This adapter allows you to utilize two 18-volt Ryobi One+ batteries with a Ryobi 40-volt tool. It's essential to note that this won't work with all Ryobi 40-volt tools due to the battery configuration. Other tools may also have unique requirements for the third and/or fourth battery contact point. I've personally used this adapter with the Ryobi RY40002 Expand-It powerhead (string trimmer). Please exercise caution when handling the exposed wires, as they are sharp and can cause electrocution. This is a reworked version of my Ryobi One+ double battery pack (https://www.thingiverse.com/thing:2664154), which itself was a rework of Simhopp's USB Power Bank for Ryobi 18V batteries (https://www.thingiverse.com/thing:1897607). Required non-3D printed components: (7) #6 1/2" screws (4) #8 1-1/2" screws (4) #6 1" screws (1) Compression spring, 1/4"x13/32" (or similar) 12-ga wire
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