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Milwaukee M18 Power Tools Battery Interface

The Milwaukee M18 power tool uses 18-volt lithium ion (Li-Ion) battery packs. The battery packs contains five 3.6v lithium ion power cells that provides 18v and peaks at 20v when charged.

In order to figure out how the tool operates with the battery, we ripped up a piece of paper to cover the two middle pins. We tried it on the Milwaukee M18 Oscillating Multi-Tool. We determined that the Milwaukee M18 power tools will not operate without either or both of the middle pin.

So if you want to interface to the Milwaukee M18 power tool with other battery source, you'll have to fake out the two middle pins. The question is how to fake it out?

To answer this question, we purchased the Makita 18V LXT Battery Pack to Milwaukee M18 RedLithium Power Tool Adapter on Amazon. Then we took it apart to see what's inside.

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