Today, New Trent released a coupon code, redeemable on Amazon for their new ACD66. It's a 6600 mAh LiIon battery, compatible with most everything, allegedly weighing 8 ozs. Does not come with a charger, but can be charged with the diminutive Apple USB Wall Charger.
That would theoretically charge my HTC Incredible 2 four times
Amazon coupon code: 2X52FVJN (code only good for Asin # B002D4IHYM)
http://www.newtrent.com/ACD66-dual-U...ry-p/acd66.htm