After much internal debate, I pulled the trigger on a Greenworks 40 volt string trimmer/blower combo pack.
I estimate that I have about 350 feet of edging between the front and back yards combined. I didn't want to run the battery all the way down, so I chose to do the back yard, which took 1/2 of the battery capacity; topped it off, and then the front which also took about 1/2 battery capacity. One half charge only took about 30 minutes to top it off, maybe less.
One thing I noted is that the string reel (the thing that holds the string) is smaller than my plug in electric string trimmer. Meaning that it will have to be swapped out more often. In time I'll know how big a deal that will be.
Granted i only used it once, but I am quite pleased with it. The blower however, has a bit of a high pitched whistle. Not ear piercing, but not a pleasant sound. Come fall, If I use it more, I'll just put in my ear plugs.