Running a contracting business and having employees within this market (those who know , know.) can be a challenge, some times employees steal your batteries and they end up in pawn shops, Thus we needed batteries but as a small business we watch out budgets and found these. We heard it all from Mulwaukee reps to Home Depot delivery teams and sales guys say these will burn out your tools, etc etc. After much use we've had no such issues, Actually we noticed that the output was much much stronger then then comparable Milwaukee stock batteries but on occasion felt they didn't last longer.Although we can't back this up as we may have been using said batteries more or less on each day. Anyway they took a charge quickly, lasted as long as they should and worked in everything from drills, impacts,automotive impacts , chop saws, the Milwaukee compressor,radio, etc etc. Definitely recommend these!!!