Over on Amazon, Poweradd is currently offering their Pilot X7 external battery pack for $31.99. However, you can get $7 off if you use the promo code B9RHC8QP at checkout. Effectively making it $24.99 This battery pack has a capacity of 20,000mAh, which is more than enough to charge up your smartphones a few times. As well as a few tablets. It also has two USB ports, so you can charge multiple devices at the same time. Always handy for those that have a smartphone and tablet. It uses four LED lights to show you how much juice it has left, it's not as great as having a display to show you, but better than nothing.