Dickie D is back with the Anker Astro Pro (2nd Generation) backup battery. This is a 15000mAh battery pack, which holds enough power to charge smartphones 4 to 7 times and tablets 1 to 2 times before it needs to be recharged itself. The Astro Pro identifies what device you want charged and enables the best charging configuration for it thanks to a built-in chip. You can charge up to three devices at the same time. It also comes in a 20,000 mAh version. The Anker Astro Pro is now on sale for $69.99 for the 15,000mAh, and $79.99 for the 20,000mAh.