Ryobi battery to Craftsman/Sears cordless tool

A battery adapter so you can use Ryobi One batteries with Sears Craftsman 19.2v tools.

Mar 2023 If you want to tinker with it, I've included the step file for the middle shell. It was modeled in FreeCAD. To make the full part, you merge that with the bottom Ryobi base stl in the list.

I have a big set of Craftsman 19.2v cordless tools from a number of years ago. The batteries were NiCd and have all failed, but the tools still work well. In the meantime, I've moved over to the HomeDepot/Ryobi 18v system because I like some of their unique tools. I don't want to buy new Craftsman batteries and a Li charger and maintain a whole separate system.

With this adapter, I can use the Craftsman tools with the Ryobi batteries.

Starting with Simhopp's Ryobi battery receiver model, I made a shell that converts the Ryobi battery shape to the Craftsman battery shape, and I merged those two parts together.

The Craftsman side accepts the top connecting piece from one of my dead Craftsman NiCd batteries. If I stack it all together, I get a Ryobi battery connected to a Craftsman tool.

You need to harvest the following from an old Craftsman battery:

• The battery top

• The electrical contact assy

• The release buttons

• The button springs

• The 5 assy screws.

For the electrical contacts use Ryobi Contact Plate holder 300001044 or Makita 643918-8.

With the adapter, the Craftsman tools are operating at 18v nominal, not 19.2v. So far in testing, everything works fine and it's not having any noticible impact on performance.

Here's a video! https://youtu.be/kxD3raEd51E

Model descriptions:

Sears_Ryobi_Adapter_Final.stl --- This is the main adapter part.

ryobi_t-s.stl --- This is the clamp piece for the electrical contact.

Ryobi_Base_Fixed_Final.stl --- This is a rework of the part I mixed this thing from. I modified it a couple ways (the electrical contact position and enlarging one of the cutouts on the bottom) so it worked/fit better.

Notes:

Print with 1.2mm thick walls, which will get you a wall line count of 3. It speeds-up the printing by about 20% since it avoids a bunch of small fill printing and retraction. The walls are thin enough that it's doesn't increase the weight much to do so.

Printing at 0.32 height speeds up printing time about 40% over 0.20 height. It's about an 8 hour print at 0.32 with 60mm/s print speed. (The photographed part here is in-fact a 0.20 print. It took about 14 hours to do, but does look nicer than my 0.32 test prints.)