I take the new 40v Ryobi string trimmer RY40250 out for a rip. The first 11 minutes is un-boxing blabbering. If you just want to see green stuff getting destroyed skip ahead to 10:54 .
10:54 start trimming tall grass along/in ditch
15:10 showing and talking about my favorite edc knife you can buy here https://amzn.to/2YHfStJ or save a bit and get the 6 pack https://amzn.to/2YjtRKO
21:60 cutting thistles and other thick weeds
27:30 cutting needle thistle “the one that looks like it has sewing needles attaches to it with a really thick stem and purple flower heads
28:30 bye bye poison ivy/oak?
32:02 biggest thistle I have found 1/2″-3/4″ stem cut like butter
33:50 side by side with the 18volt hybrid trimmer
37:54 cutting sawgrass, wild rasberry bushes etc in ditch area on new property with the last of that battery
Most of the cutting with my 5ah battery was recorded in this video. It is missing about 10 minutes on the other side of my driveway. So I would say that you should get about 20-30 minutes of pure cutting out of the included 4ah battery.