Unlike your standard backup battery pack, that only powers USB devices, these powerhouses from Omnicharge will juice up your phone or tablet many times over and they also power anything with a standard three-prong power cord. Available in 2 sizes: the 65W Omni 13, which has a 13.4K mAh battery and the 100W Omni 20, with a 20.4K mAh battery. The 20 also supports wireless Qi charging.