Lasts at least twice as long as my standard Lithium battery pack. I don't think I've ran it down yet. But often kill my standard battery. Don't get me wrong the standard battery runs a long time too. So far used mostly for Drill/Impact Driver.
I am a carpenter and use of cordless tools is becoming more useful with the wide variety of tools offered. there is not enough differnce from the nicad to the lithium to justify me to buy it again even with all of this said yes it is a better battery than the nicad but not as much as I was lead to belive.