I have a Greenworx one. 18v maybe, not sure. Works just fine for my reasonable size front and back yard. Celebrated the day I got rid of my Poulain Pro gas strimmer that was nothing but a constant headache. Thinking about getting a battery lawnmower now as the tech has come a long way. The Greenworx strimmers are cheap enough (for the lower voltage battery ones) to splurge for an extra battery if you have a larger yard or another tool. I think my strimmer and leaf blower work on the same battery and I use the cordless leaf blower to dry the car and bike after a wash.