I have used Metabo cordless tools for a very long time and for whatever dumb reason, I used to buy the small batteries. Face palm myself! I started getting the 3 AH batteries as my old batteries died, but this multi volt 4/8 amp hour battery is the way to go. I used my reciprocating saw to trim tree branches for half the day and this battery still had 3 bars of juice left in it when I was finished. Then I popped it onto my cordless angle grinder to cut up several pieces of 3" pipe in the yard and it STILL had juice left in it when I was finished. I have charged and used it quite a few times at this point and have not noticed any diminished performance. If you pair it with a driver or drill I don't think it will ever run down. Ha.This new charger is a huge improvement over the old ones too. It charges up all the slide style batteries (whether they are multi volt or not) in half the time or less of the old chargers. This package is a great buy!Great battery life, the best I've tried so farWhat I like about this battery is like the song "never gonna let you down". My Metabo tools are MultiVolt technology so this battery is what the doctor recommends.Big saw with lots of power. Very comfortable to use. Total beast.Great battery the price was just highWorks great2 chargers and 4 batteries have broken on me in the last 90 days. I'm a professional contractor, and absolutely love the Metabo tools, but the battery/charger durability is terrible. I'm in over $500 for worthless batteries, service is slow lately on turn around.Much better than the standard Metabo batteries, these have battery life indicators. Perfect