Ryobi One+ 18v Battery to Ridgid Tool Adapter

Use this model at your own risk! This model is a DIY adapter for power tools and creates risk of electrical shock or fire if misused. Although this is a simple adapter, basic knowledge of electrical work is highly recommended to proceed with this project and ensure safe operation.

This adapter enables use of Ryobi One+ 18V Batteries on Ridgid 18V tools. This is a 4 part design intended to be semipermanently installed into the Ridgid tool and must be disassembled in order to be removed. The Contacts holder fits into the retention clip on the Ridgid Tool and screws into place preventing the adapter from detaching from the tool.

Fit of the battery contacts and clips are designed to be tight in anticipation of loosening a bit with use.

I designed this for use on a Ridgid 18V Brushless Angle Grinder with Ryobi 2AH, 4AH, and 6AH High Performance batteries - It's been working well with all of them so far. Printed without supports in PETG with 3 perimeter layers and 20% infill for strength.

Tools Needed:

• Wire cutter and strippers.
• Crimping tools or solder tools based on your selection of terminals.
• Long reach, thin screwdriver to match your screw selection. Model has a 10mm wide opening to install some screws. If using hex screws or star drive screws, an matching allen key will work.

Required Materials:

• 4-6 inches of 14 gauge wire, preferably in two colors to distinguish positive and negative leads. Thicker gauges will also work, but will be tight and terminals must be sized to wire.
• 2 Male Spade Terminals matching size of wire
• 2 Keystone 209.1 Leaf Spring Battery Contact or equivalent size to match the Ryobi battery contacts.
• 8 #6-19 Steel Thread Rolling Screw, ½" length with Countersink head. 10mm Countersunk M3 screws will also work, but will be less secure.

Installation Steps:

1. Slide the Ridgid Tool Mount into the tool.
2. Measure and cut length of wire needed to attach Ridgid Leads to the corresponding contact on the Ryobi Contact Holder. Be mindful that in this configuration the positive and negative leads are opposite one another. Each wire should be about 2 inches each.
3. Install spade terminals on wires. Ensure secure crimping and there are no loose strands.
4. Install leaf spring contacts on the wires, consider the required orientation of the wire. Again be mindful of clean and tight electrical connections. If needed, solder the connection instead of crimping (always either crimp or solder, never do both).
5. Install the leaf spring contacts on the the Ryobi Contact Holder ensuring correct orientation. This is easiest to do before the Contact Holder is installed into the Ridgid Tool Mount.
6. Insert Spade terminals into the Ridgid Tool power contacts. The Ridgid Tool Mount may need to slide out in order to allow the spade to fit all the way in. It should also help secure the spades in place.
7. Position wires and install the Ryobi Contact Holder into the Ridgid Tool Mount. This should be a very snug fit and will fill the retention slot on the Ridgid Tool.
8. Double check your wiring and electrical connections ensuring  positive and negative leads lead to corresponding battery contact, that there are no shorts, no loose terminals, and no loose wire wire strands.
9. Install retention screw to secure the Contact Holder. Once this is done the Tool Mount should be completely secure on the Tool. Be careful not to over-tighten, this may obstruct the battery stem from seating in the Contact Holder.
10. Install the Stem Spacer with 4 screws.
11. Install the Ryobi Battery Cleat with 3 screws.
12. Test Tool.