Amazon is offering the RAVPower Element RP-PB07 10400mAh External Battery Pack / Power Bank w/ 2x USB Ports for a good price.

This can charge an iPhone 4-5 times.

Item has a review of 4.5/5.0 from 1234 reviews

1. Amazon Price is $35 Shipped

2. Use coupon code F742MN29 to get $10.50 off

Final Price : $24.50 Shipped