Milwaukee M18 Lithium Tool Battery Adapter

by macsboost, published

Milwaukee M18 Lithium Tool Battery Adapter by macsboost Sep 23, 2012



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This receptacle fits the Milwaukee fuel M18 XC 4.0AH cordless tool batteries.

There are screw holes such that you can adapt this battery to a black and decker 18V weed whacker battery.

Power to the people!


disassemble your black and decker battery, screw this adapter onto the bottom of it, do some creative wiring and poof, you have a high powered M18 Milwaukee Lithium battery juicing your weed whacker!

This adapter could come in handy for other uses as well. Tested and working with the M18 Battery Packs!

These batteries are from the Milwaukee Fuel M18 series cordless tools.
18V nominal, 4.0AH, 10X 18650x2.0AH in a 5S2P configuration. They are Samsung cells rated for 50A continous discharge.

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What did you use to make the battery contacts? I'm thinking of making some adapters like this for my older Milwaukee 18v cordless 3/8" impact, that thing will take off lug nuts with ease but its failing point is crappy Ni-Mh batteries that don't last very long.

standard flat spade terminals. Instead of crimping with a normal crimper, put the terminals in a vice and mash flat. Then glue in using epoxy.

Hello. I'm looking to get one of these made to adapt my M18 batteries to black and Decker 20v max weed eater. Would it be possible to make something for me?

For anybody reading this 20v is a gimmick. All 18v lithium battery packs measure at 20v

Printers will vary and prints will shrink. There are different versions you can try if you don't want to modify yourself.

great project
i found it needed a lot of reworking to actually fit
the rails' on the M18 that slide in to this thing are appr 7mmhigh'
the adapters `channel' is only 5mm high
the rest appears ok
an someone please confirm this works

Interesting , I built an adapter from a old black and decker battery , all I used was the contacts and the plastic holder ,by soldering an extension to the contacts,the Milwaukee 18 volt slides into the B&D housing , had to modify the slid ,But doesn't have the retainer clips But works great , the adapter shown here is a great idea , where can I buy ?

Will it damage the battery from over discharge?

What are those metal prongs you use to tap into the battery?

Coming soon, Milwalt or Dewaukee??? you decide

Anyone willing to make these for me to purchase? I need 200 for a project.

!! I'm guessing electric car and surplus power tool batteries equals economical transportation. But how are you going to charge all 200?

Brilliant! Thank you! :)