I was not satisfied with the available battery adapters for use in my tiny electric go-kart build. I needed something stiff that I would never have to worry about.

Designed for G-MAX 40V series of GreenWorks batteries. But will fit other 40V series GreenWorks batteries as well.

Features polarity markings, high-current conductor, 20x20mm mounting hole pattern, and strain relief.

Required:

• 2x 4.5cm piece of generic 1/4" copper water line tubing. (Wall thickness is 0.5mm.)
• 2x 15mm M3 socket cap bolt with M3 nut

Print vertically in PETG for least amount of support material and smoothest fit.

Build it:

• Straighten and cut approximately 4.5cm of 1/4 inch copper water line tubing.
• Carefully flatten the last 13mm (1/2 inch) of one end of said piece. Avoid imprinting sharp burrs. Use a bench vice with smooth jaws.
• Verify blade thickness is 1.0 to 1.25mm and blade height is about 9.5mm to 10mm.
• Chamfer cut edge if desired.
• Solder wire (or female banana jack) into open end. Avoid getting solder on the outer wall of the copper tube. File off if necessary.
• Insert new blade terminal into printed adapter from the inside; wire-first.
• Repeat for other terminal.
• Push both terminals in firmly while maintaining vertical alignment. Approximately 13mm of the blade contact should protrude from the inner backstop. (see picture)
• Finish it off with the strain relief shoe and two 15mm M3 bolts w/ nuts.