If you’re not a fan of DIY kits like the Mintyboost to give your portable devices more juice on the road, this external battery from Macally may be more to your taste.
https://gizmodo.com/mintyboost-diy-aa-usb-charger-177527
The product page states that it’s “for” iPods, but the miniUSB port and the included cable should allow many other USB compatible devices to be charged. On a full charge, this battery adds 6-8 hours of play-time to your hard drive based iPods. There’s also a LED battery indicator so you know how much juice is left.
Useful device for mp3 players and cellphones that can be charged via their USB ports.
Product Page [Macally via Coolest Gadgets]