$49 for uNu Enerpak 11000mAh Portable Battery Pack for Smartphones and Tablets ($99.95 List Price)

Red battery statuses are shepherded into greener pastures by an 11000mAh battery that, with its 1A USB port, can charge nearly any smartphone or tablet. Since the pack includes a pair of separate USB ports, technophiles can juice two different devices simultaneously. The battery pack—uNu's most powerful—adds up to six times as much battery life to your smartphone, and an LED battery-life indicator specifies when it's time to recharge the battery pack or toss it at a bolt of lightning.

Features

Universal compatibility with smartphones and tablets
Dual USB port 2.1A for tablets and 1A USB port for smartphones
At 11000mAh, uNu's largest battery yet
Adds up to six times as much battery life to smartphones
Charges two devices at once with separate USB ports
Forged from an eco-friendly lithium-polymer compound
LED battery indicator