According to the specs you're only going to get a 15 minute run time off of the AP80 battery! I did my costing based on the AP160 which gives 30 minutes. And that's up to 15 and 30 minutes....For a homeowner I could see it but it just seems impractical to me for a pro.
I do have a B & D cordless hedge trimmer that I use for touch ups and little boxwoods, for one handed ladder work and when I'm climbing behind shrubs and a building. It's quite handy, but it's only a supplemental tool. I think the cordless stuff is great if you're not going to use it for extended periods.