Review on Upgrade Your Milwaukee M12 Tools With Waitley 2 Pack 12V 3.0Ah Replacement Batteries: Get More Power And Capacity For Your Work by John Ortiz

Does NOT positively lock into tool! Not even usable on my oscillating multi-tool. Battery pops out after 20 seconds of use. It's kind of usable in my right angle drill and 3/8" ratchet, you just have to constantly check to make sure battery stays seated.I'll stick the OE Milwaukee packs from now on.Update 12/09/21: checking voltage after a full charge, I found both batteries will only charge to 11.7 volts! Now I'm glad they couldn't be used in the tool. I only use these batteries for a 12V led work light now, with a wired adapter. With factory batteries, I get almost 8 hrs. With these batteries, I get about 4 hrs. And they only have maybe 10-12 charge cycles from new.Can't recommend these batteries, they're just junk!