I have the Kobalt 40v weedeater and leaf blower. I live in a subdivision, slightly larger-than-average lot for a neighborhood of 1600-2000sqft homes. I can do all of the weedeating, edge the driveway, curb and sidewalk from driveway to front door, weedeat backyard and edge around 13x13 patio, then pop the battery out of the weedeater and into the blower and blow off everything, and still have 1 out of 4 lights left on the battery meter. Only once was I NOT able to do everything with 1 battery. I had done all the weedeater work and was about halfway through blowing off everything when the battery died, so I popped in the other battery (the one that came with the blower, which I bought separately) and finished. And that was only because I'd let the yard go a lot longer than I should have.
I absolutely love them...........my only potential concern is what Lowe's will do with the Kobalt brand, in general, now that they've purchased Craftsman.