Not bad! I use cordless power tools out of yarn. I use my tools 5 days a week and there to move batteries after a few years. The higher amp hour rating gives the tools more "punch" the fact is, most Ampere avalible for the tool to draw. however after a few weeks, it is well, will report if it fails sooner than OEM batteries, but keep in mind there are only a handful of manufacturers lion, I am really impressed with this package, it is ideal for higher print items like circlar saw, sawzall, rotary hammer and so on.