Plenty of power.2.5 ah battery more than enough to do 1/4 acre lot more than twice. Coming from gas, takes a little bit to get used to throttle control.
Love this trimmer. Very powerful and more than ample battery life. Fairly easy and quick to recharge battery. Trimmer string holds up well even when used against chain link fence. Only negative is that it is heavy and somewhat uncomfortable to use, but the plusses more than offset this.
I bought this trimmer a month ago and have nothing but great things to say about it. I was concerned that a 2.5Ah battery wasn't going to be enough, but I am able to do all the needed weed whacking on one charge. Very powerful and lightweight. Highly recommend.