the mower came with two 4 ahr batteries, they last about 30 minutes or so, i have two off brand batteries also but they only last about 15 minutes. I have the dewalt chainsaw and that came with a couple large flex volt batteries and they last quite a while. I usually have use four batteries to get the job done. That is the nice thing about the dewalt is the batteries are fairly inexpensive and you can use them for all your tools.
Neil Vanderbosch
Posts: 15