While Energizer's moving forward with its newfound Qi partnership, its bunny-less arch rival seems content right where it's at. Duracell's WildCharge-based myGrid charging mat, which was actually introduced over a year ago, is finally gaining a second good reason to purchase one: the myGrid USB Charger. The nugget you see above is a rechargeable Li-ion battery with a USB output, and according to Duracell, there's enough juice in there to extend the life of most smartphones by four hours and the life of most e-readers (Kindle included) by up to 100 hours.
