Just got this 4000 mAh external Mophie juice pack power station. Decided not to go with the case power packs this time...longer service when the phone style changes. Small, fits into pocket or whatever...charges iphone at least 2x, and partially ipad once.
http://www.mophie.com/juice-pack-powerstation-for-iPod-iPhone-iPad-p/2027_jpu-pwrstion-2.htm
USB based, and fits my needs.
http://www.mophie.com/juice-pack-powerstation-for-iPod-iPhone-iPad-p/2027_jpu-pwrstion-2.htm
USB based, and fits my needs.