Supposedly, this case offers 1500mAh of extra power while only weighing 0.05lbs. You can safely leave it on your phone all the time, and it even comes with a handy on-off switch to control when it charges your device.
This kind of convenience does come at a pretty steep price: the case will set you back $69.99, although you can get $5 off with promo code PSHTC123 at the checkout. I’m sure these types of cases will become more and more common as non-removable batteries become the norm, but I’ve never actually tried one of these out myself; be sure to let us know if you have!
[PowerSkin via Android Community]