If you go the Milwaukee route, buy the fuel model they are the strongest. Batteries are the $$$
Correct and they're so many Chinese fakes out there that are dang near perfect in appearance but the cells are trash.
Yep; bought some off Amazon that were DOA. Sent them back; bought Milwaukee batteries on sale at Home Depot. Dead in 6 months. Milwaukee replaced them and paid freight both ways, though. They have a very easy warranty program online.