I have some 12 AH batteries that I run on the Milwaukee 6" grinder, and they last forever on anything else. The grinder eats them up pretty good, though.
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My father in law gave me a HF angle grinder for Christmas about 20 years ago. I was not impressed because I had a Makita angle grinder but 10 years later the Makita wore out its brushes and the spare brushes from the HF fit the Makita! So now both he Makita and the HF are still grinding away. Last summer, I ground off about a 100 square feet of half inch concrete with the HF to install vinyl floors. It got hot but it didn’t fail. These were corded tools, so it is off topic, but it shows that tools with brushes are not inferior.