Most of portable chargers use rechargeable battery, some but exception, such as the following portable emergency charger using AA batteries.
The portable charger measures 82 x 34 x 20mm, and weights 25g. Through integrated USB port, the emergency charger can juice your USB devices like mobile phones, MP3 player, also including iPhone 4, iPhone 3G/3GS and iPod at any time. The difference is that the charger need two AA batteries to draw electricity instead of built-in rechargeable battery. And the built-in LED flashlight provide you emergency illumination. Apparently this kind of design is better for field trips and activities.
The portable emergency charger with LED flashlight is priced at $15 USD. If you’re interested, jump to Gadget4All for more details. Additionally, if you need more options, you might like to check the portable USB emergency charger, ZAGGsparq 2.0 portable charger, and more via “portable charger” tag.