I own a slightly different model of this Worx 20V trimmer/edger and love it, my 20V Worx blower too! My trimmer came with 2 batteries but, using one battery, I can trim my (1/4 acre) yard, edge both sides of a 50’ driveway, remove the battery and slip it onto my Worx 20V blower and blow off the driveway. I’ve owned the trimmer and batteries for 3 years and am starting 2nd year with blower, but both batteries still charge well and last as long as year one. IDK, but buyers will probably be eligible to sign up for “free spools for life” program. 6 spools are free but s&h is about $9. They are small spools (10 ft. of line) but last quite a while. I use 3-4/yr. This states it has push button line feed, like mine, but my button is on the front portion of the handle and works great … but they must have moved it on this model because I don’t see it. But for anyone considering this trimmer/edger I can attest to Worx being an excellent company and I couldn’t be more pleased with both my trimmer/edger and blower.