Yeah, that's an awesome deal. That's like $8 per set of (4) and then getting an almost free charger on top of it LoL. Go for it man, you'll really be happy with them...
Keep in mind though, most batteries you'll use for UltraSabers are AAA (I think).
Cool, will do, thanks for the advice and good info. No worries, I have other devices that use AA, so I'm sure I'll find a use for everything in the pack.