Since I travel a lot and sometimes don't have access to outlets. I was thinking about getting a battery/powercell back-up. Does anyone else use them or these I found?
Ventev PowerCELL for iPad 2, iPad - iPad Backup Batteries
mophie juice pack™ powerstation - travel battery charger for iPod, iPhone, iPad and other smart phones
**the Mophie Juicepack Air is really good too..I have that for my iPhone 4
Power! Dual 1850 Cell Phone Rechargable Battery Backup (PMR-PPC3) | Powermat