Dr. X,
I like the Rigid brand as well, but my weed whacker crapped out and they had a Lithium/Ion/corded one from Ryobi on sale, so I went with it.
Came with 1 battery and a charger that will charge all their batteries.
I'll probably work on using one of their battery offering for my Sept base camp trip?

Hopefully I won't have any battery failures with the Ryobi?
I must say I was duly impressed with it initially.
Good packing, quality construction, and you can actually understand the directions. ;) ;D