Due to the fact that I use Dewalt cordless tools, I have created an adapter to use a Dewalt 20v Lithium Ion Battery with my 18v RYOBI One+ hedge trimmer

*** Updated 18V Top STL To Version 3 - 4-21-2018
Re-worked the 18V Ryobi tool top STL, I moved the position of the contacts for the Ryobi tool up, as I found that the connection was just low enough to sometimes not make contact.
I also adjusted the inside walls of the part to make it somewhat thinner, hopefully it will make it easier to assemble.

*** Major Update Updated To Version 2 - 3-23-2018 (ALL STL's Modified)
Based on some of the feedback from here, and my own experience I have (finally) made some changes to this adapter. Changes are as follows:

• Made the 20V base slightly wider to fit the Ryobi tool better.
• Adjusted the holes for the Dewalt battery terminals forward to line up better with the 20v terminals.
• Pushed the base of the clip out in order to improve clearance so that the top of the clip can push further in to clear the base of the Ryobi tool when attaching/detaching the adapter.
• Adjusted the width of the clips slightly smaller to account for printing tolerance
• Adjusted the distance the tab of the clip sticks out to better hold on the Ryobi tool.
• Changed the angle of the top of the clip steeper, the clips should now automatically push in if don't push them when installing the adapter
• Changed the mounting surface for the 18V battery to make it easier to epoxy the spade connectors.
• Added a chamfer to the top above the 18V terminals to reduce the chance of the adapter hanging up on the contacts inside the Ryobi tool.
  • Removed the inside rings from the top part of the adapter to make it easier to assemble.
  • Adjusted the thickness of some of the walls of the upper part of the adapter.
  • I also adjusted the STL files so the parts should all now lay flat in the proper orientation for printing.

*All three files have changed somewhat, I do not believe that any of the old ones can be used, however I have not tested this.

Thank you for all the feedback and the tips that you have given for this part, It is greatly appreciated.

DISCLAIMER/WARNING - Use at your own Risk. it can be Dangerous to over discharge Lithium batteries. -Risk of Fire or Explosion-

The 20V Tools that use this type of Lithium battery have the battery protection circuitry inside the tools, not the battery, and as such the user of this adapter must be careful not to over discharge the battery.