Milwaukee 12V battery tap

thingiverse

This thing is a plug that will allow you to tap a 12V Milwaukee M12 tool battery for other uses, like running a tire or SUP air compressor. And yes, these things DO have enough capacity to inflate the 3 chambers of my Rover 220 Kayak using the Shark pump. And they are so small you can bring along several to be sure. Get a Milwaukee M12XC 4 Ah battery for even more capability. Print the main tap housing and the cover. Get a cheap spatula from a grocery store and use a Dremel tool to cut two 6mm x 21mm strips. Smooth the edges, drill a hole near the ends and solder up some 16 Ga wires. Clean out the supports from the main printing and insert the metal tabs in the slots as shown. Pot it up with epoxy (I used JB Weld plastic bonder) and clamp it shut to cure. Pay attention to polarity. The batteries are marked. And you are only going to care about the main power tap slots, not the 3 little terminals on the bottom. If the plug doesn't fit the first time take a small flathead screwdriver and tweak the metal tabs just a bit. Mine needed to be pressed up just a fraction of a mm. Not too far as you want the plug to fit snugly. Add your favorite quick connector. I am adding an XT60 plug to mine and putting the matching XT60 plug on the devices I plan to run. Be careful and use at your own risk. These batteries have a lot of energy and can be dangerous if mishandled. Edit/update: I just tried my plug on a different battery and noticed the metal tabs were still a tad too low and would not insert easily. So I revised the design and STL file to move the vertical slots that the metal tabs mount in up 1mm. Pro tip: Slide the empty plug body onto a battery. Drill the holes in the metal tabs and solder up the wires, then slide the tabs into the slots and through into the battery. THEN add the epoxy and top cap and clamp to cure. This will pretty much guarantee alignment of the metal tabs to the battery slots. Get one of these or similar, cut the male plug off and connect a female XT60. That way you can just plug in your inflator to the battery like you would in the car.... and preserve the pump's male plug in case you want to use it in a car sometime. https://www.amazon.com/NOCO-Boost-GBC010-12V-Accessory/dp/B07HFJZP67 Device in action: <iframe width="560" height="315" src="https://www.youtube.com/embed/r3o0KQBE1BY" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>