I bought this from ebay for $13 w/free shipping. Just got it today. Hd2 is 2mm x 1mm x .5mm smaller than the hd7, so it is a little loose. But barely loose. Still fits, and stays put, doesn't slide around. Hd7 power and battery ratings are the same as hd2, so it is fully compatible. Works great! Doesn't actually add to your total maH, but you have a gel cover with a built in 1500 maH battery that charges your phone when needed. The result- led is always green or amber, so no flashing led when message is received. Also, there is no data pass through, so you have to take the case off to sync with your pc. The case comes off easily though. Case takes the same usb connector as the phone, so you can use your charger. Since it is a case, the overall size increase is uniform, unlike the pregnant bulge of an extended battery. Still, I'm going to get an extended battery just to have it and check it out. I recommend this case.
Sent from my HTC HD2 using XDA App