If you are an adept of traveling and usually staying often out of battery power then the Juice Pack Helium case by accessory maker Mophie its here to meet your requirements.
The Helium, measuring at 2.49″ by 5.49″ by 0.59″, is said to be 13% thinner than any iPhone Juice Packs. Rated At 1500mAh, the Helium delivers the same battery capacity as the Air.
Mophie proudly claims the battery pack – rechargeable via micro-USB – boosts another 6 hours of 3G / LTE usage; 7 hours on WiFi; and up to 7 hours of video playback.
It is recommended you should wait until your iPhone 5’s battery level has dropped below 20% before flipping on the Helium to get the most benefit.