Battery Equivalents and Replacements

DeWalt to Milwaukee Battery Adapter: 20V MAX to M18 Battery Adapter

Having plenty of batteries of one brand means that You can often power a long list of cordless tools that the brand provides for that specific battery system.

But what to do when You need a cordless tool provided by another brand? For example, what to do when You have plenty of DeWalt 20V MAX batteries but want to power the Milwaukee M18 battery-compatible tool? Well, either get a few Milwaukee M18 batteries or use Dewalt 20V MAX to Milwaukee M18 battery adapter...

Published: September 19, 2022.

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Different Battery Systems

DeWalt 20V MAX and DeWalt 20V/60V MAX FLEXVOLT batteries are used to power DeWalt 20V MAX tools and are not compatible with the Milwaukee M18 battery system - nor are their battery chargers compatible.

If You have the need to power very few Milwaukee M18 cordless tools and You have plenty of DeWalt 20V MAX or 20V/60V FLEXVOLT batteries, nonetheless, it is recommended to get Milwaukee OEM M18 batteries and chargers; battery charger kits can be found at acceptable (but not cheap!) prices. After all, better safe than sorry...

However, if You don't wish to do that, it is possible to power Milwaukee M18 compatible cordless tools using DeWalt 20V MAX and/or DeWalt 20V/60V FLEXVOLT batteries using DeWalt 20V MAX to Milwaukee M18 battery adapters.

But, just be aware that this is not supported by either of the brands (DeWalt, Milwaukee) - DeWalt to Milwaukee battery adapters are "third-party" devices.

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The use of such battery adapters has a few pros and cons, including:

  • The battery adapter is much cheaper than a new Milwaukee M18 battery and charger kit,
  • DeWalt 20V MAX and 20V/60V FLEXVOLT batteries MUST be charged using compatible DeWalt battery chargers - do NOT use Milwaukee M18 battery charger to charge the DeWalt 20V MAX or DeWalt 20V/60V FLEXVOLT batteries,
  • The battery adapter adds to the weight of the tool and increases the height of the battery+adapter combination, which may be important for tools that are used in close quarters and for tools with semi- or fully enclosed batteries,
  • The quality of the battery adapter is lower than the quality of the DeWalt batteries and Milwaukee tools - pay special attention to the contacts, especially when attaching the batteries often.

Note: Before buying such battery adapters, be sure to read the reviews of former and current users and go for the models with the best reviews since they have already been tried and tested in real-life situations.


adapter mLong Story Short: Dewalt 20V MAX and DeWalt 20V/60V FLEXVOLT MAX batteries can be used to power Milwaukee M18 compatible tools, just be aware of potential issues when purchasing such adapters.

One of the most popular models on the market is aikeec DeWalt 20V MAX Battery Adapter for Milwaukee M18 18V Tool (Amazon link, link opens in the new window) - just be sure to read the Q&A and reviews by the real-life users in order to verify if it fits your needs.

Of course, other brands also offer similar adapters, but this one is one of the most popular models.

Should something happen to the battery, tool, yourself, etc., it is your own responsibility...