The interchangeability seems like a huge step forward. Then once I do, I could plunk down another $15 and be fully compatible with the Ryobi 20V line. I think I got a great deal, but I am most pleased by the fact that if and when I want to get a 20V tool all I need to do is plunk down $15 for a battery adapter and then my entire 18V toolset can share the new battery.
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The adapters are usually plastic with the pins for one manufacturer’s battery on the bottom and for a different manufacturer on top. Other tools like Rigid may be compatible, but aren’t covered here. Since around 2021, many power tool batteries are interchangeable with inexpensive aftermarket adapters, indicated by the compatibility chart above. What power tool batteries are interchangeable? DeWalt 20V batteries attached to jumper cables ($36).DeWalt 20V batteries on 12V cigarette lighter products ($37).DeWalt 20V batteries on PowerWheels ($14).DeWalt 20V batteries on a Dyson stick vacuum ($21).DeWalt 20V batteries to charge USB & USB-C devices ($14).DeWalt 20V batteries on DeWalt 18V tools ($10).
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I’ve been using a similar $10 adapter to power my DeWalt 18V tools with my DeWalt 20V batteries for years, which even DeWalt manufactures now. I use the adapter with the * above all the time to power my Black and Decker tools with my DeWalt batteries.