Something I didn't think of when I decided on an mp3 player for my edc kit, is that the one I chose needs a usb to recharge. I know - DUH! The problem is that I don't use it regularly so am prone to forgetting to charge it.

My question is, does anyone have a good portable recharging system for these devices? I've seen battery powered chargers and cigarette lighter chargers for cel phones, and assume that a usb charger is a usb charger, but is there any particular model that works especially well but won't break the bank.