That's one reason I stick with AA powered devices when possible.
I think I've linked to it before, but this is why on my long list of things I should do is making a
Minty Boost charger.
I like the idea of being able to use AA's to recharge devices with internal batteries if needed.
I think there are commercial versions out there too, but building it seems like more fun
.
Edited to add: here is a commercial version of this concept from Energizer which uses 3 AAs:
Instant Charger