I ordered this from the HTC web site and just put the battery in today. It so far is GREAT! I havent done much so far today but on comparison with my regular battery which was working pretty well this is much better. Its been 12 hours, I did various surfing and mail check through the day, had it on wifi since then, played on it a bit and I still have 80% power left. Now its a percentage of a larger amount in comparison to the stock battery, with the same activity on the stock Id be around 50%. But for $45.00 I got 2 count them 2 batteries and a wall charger (that also has a USB port so the phone can be connected too!) Its an official HTC battery, says its the same as the mytouch 4g battery and the HTC Merge charger. The cover is a real pain to get on and off but a much better choice than a bulky extended battery with no case. My stock battery got much better as it got trained so I expect even better from this. So far a great deal! HTC Thunderbolt Verizon LTE 4G 1700mAhx2 Battery+Dock USB Charger PD42100 I posted the above in a different thread a few days ago, couldnt figure out how to link them so re-posting here. Its been a few days and its def worth it. Only thing is the charger is rated at 350ma which is way less than the stick charger. It charged, just took a lot longer.