@everetra - I definitely need to save money on my batteries. This might do the trick.
At work I listen to my portable radio all day long. I don’t even use rechargeable batteries; I just never got around to getting them I guess. So I go through a whole pack of AA batteries every few months and think nothing of it.
I need to get one of these converters and just use them at work. Of course, that would be using company electricity, and I suppose I’d have to check in with the boss on that.