I purchased this deal for only $40. It comes with 2 HTC 1800 mah batteries and charger. The batteries are about 1mm thicker and makes the door fit a bit tighter but they work very well and is a welcomed upgrade from stock. Plus you always have a battery on standby. After using these batteries for a week now and messing around. I can surely say I have noticed increased life and usability.
Amazon.com: Sprint HTC EVO 4G 2x1800 mAh Battery Longer life than OEM+ Wall Travel Dock USB Charger also for Verizon Incredible Droid Touch Pro2 My Touch Slide: Cell Phones & Accessories
These are not knock off batteries.
I was able to get 1 Day and 1hr out of one battery with a few phone call and text messages
Amazon.com: Sprint HTC EVO 4G 2x1800 mAh Battery Longer life than OEM+ Wall Travel Dock USB Charger also for Verizon Incredible Droid Touch Pro2 My Touch Slide: Cell Phones & Accessories
These are not knock off batteries.
I was able to get 1 Day and 1hr out of one battery with a few phone call and text messages