Ryobi One+ Double Battery Pack 18V

thingiverse

This is a battery pack to power two Ryobi One+ batteries with a tool (https://youtu.be/KomE9KIKsI4). It features mounting points for two batteries, any kind of Ryobi One+ battery supported, and a switch to select which battery powers the tool. This design does not link batteries in series or increase voltage to the tool. You could wire it differently and run tools at higher voltage, but that's not recommended. If you do, record it and post on YouTube! This design borrows heavily from flyingaz's Milwaukee to Ryobi Battery Adapter (https://www.thingiverse.com/thing:1677812) and simhopp's USB Power Bank for Ryobi 18v One+ Battery (https://www.thingiverse.com/thing:1897607/). I couldn't have done it without using their designs. I printed this design with PLA. Be careful when tightening screws, as the hole loops on the bottom are weak and can break easily if overtightened. I originally planned to use four screws to hold the two lower halves together but realized that wasn't necessary due to the switch box's mounting screws. Non-plastic pieces used: (1) DPDT switch (I used a Gardner Bender GSW-16 toggle switch) (6) 14-gauge solid wire (4) #8 3/4" screws (4) #6 1/2" screws (2) #6 1" screws (2) 3/8" x 5/8" springs (2) 1/2" strips of metal for battery contacts To assemble the design, follow these steps: 1. Attach two or four #6 1" screws to hold the two battery shells together. 2. Drill holes for wires to pass through from the switch box into the space between the battery shells. 3. Run four wires from the switch box into the battery shells, two for each battery. Make sure you can identify which wire is which. 4. Cut away excess material from the wire posts and insert wires into them. 5. Push the wire posts into the battery shells and push excess wire into the space between the battery shells. 6. Attach the switch box to the top of the battery shells using four #6 1/2" screws. 7. Flatten and bend 1/2" strips of metal for battery contacts on the top stem. Solder them to two short wires that connect to the switch, or use loop terminals instead. 8. Insert buttons into the top stem with 3/8"x5/8" springs. 9. Connect all six wires to your switch using loop terminals. Make sure you can identify which wires are positive/negative and which connect to each battery before doing this. 10. Push the switch into place and attach the top stem to the switch box using four #8 3/4" screws. Total estimated print time: 17 hours Total estimated filament used: ~66 meters Update: After about a day, I'm seeing some delamination in the middle front wall of the switch box. Making the walls thicker and using longer screws from the top stem into the switch box may help. Printing with higher infill might also be beneficial. Update 2: I've added new versions of the switch box and top stem to make it stronger. The updated version is 'SwitchBox_v4' and 'TopStem_v2'. You can use SwitchBox_v4 with TopStem_v1, but it won't have the 5th screw hole on the front. With the updated pieces, you can use #8 3/4", 1" or 1-1/4" screws.