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. It’s available today at CVS, Walmart, Target and Amazon for $34.99, and that does indeed include both mini-USB and micro-USB adapters. The full release awaits your eyes after the break. Continue reading Duracell myGrid USB Charger gives your Kindle 100 extra hours of life for $35 Duracell myGrid USB Charger gives your Kindle 100 extra hours of life for $35 originally appeared on Engadget on Tue, 09 Nov 2010 09:00:00 EDT. Please see our terms for use of feeds . Permalink