Roy66

I've heard a lot of good things about cordless impact drivers and have taken the time to find out quite a bit about how they work. I understand that there is a hammer and anvil mechanism inside which creates additional torque by hammering on the side of the bit. A lot of people online are saying that the great thing about the cordless impact driver is that they do not use any additional battery power to produce these high impacts. How can this be true? Where is the power coming from if not the battery? Cheers, R