RAVPower’s RP-PB809 Portable Battery Pack is currently being offered at just $29.99 shipped, originally priced at $69.99. At the size of a package of cigarettes, it is designed to be carried inside your bag or backpack so it can travel with you and provide reliable backup power on the go. Product page. Continue reading to see how a lower capacity version of this battery worked out for another user.

Notable features:

  • 7800 mAh large capacity, enough for 3-4 charges for most smartphones.
  • Made for both tablets and phones: iPad / iPhone / Samsung / HTC and many more.
  • Easy to carry & Compact design ensure you the perfect On-the-Go experience.
  • 4 LED power level indicator / Dual output: Can charge up to 2 devices at once (1 x 5V/1A + 1 x 5V/2A output).

[via Amazon]