We used it all day on the one battery and it was still going strong. I have got to find me one of the little files for the chain, I'll probably get a spare chain and sprocket. One thing you have to watch when cutting a bunch of vines and crap is that the chain doesn't clean out all of the debris and you will have to remove the chain cover and clean it, the little tool is on the saw and it doesn't take but a minute to open it up and clean it out.