Pardon the lengthy post. It turned out to be way longer than I expected... The Thunderbolt is my first android phone, in fact my first smart phone. So by no means am I an experienced android user. While following the news on the release of this phone I was very excited about getting my hands on one. Knowing full well of the battery life issues the Thunderbolt is subject to, I still went out and purchased one. I figured I'd test my own unit's capabilities on battery life and share my results on here. First off, the phone is basically running stock with the exception of the following: - 3G area only ( 4G not available yet, but will be in my area some time during Q2 ) - Using stock 1400mAh battery - No additional apps were installed, although I couldn't resist Angry Birds, but I manually closed it after 10-15 minutes of play - Phone has not been rooted - The only apps I force stopped from the "Manage apps" menu were Blockbuster, V Cast Apps, VZ Navigator and TuneWiki (mostly bloatware from what I've read) - GMail was set up with default settings and email alerts are being sent to the phone - GPS and Bluetooth was turned off - Display brightness was set to 25-30% (still quite bright) - HTC Weather widget animations were left active Phone battery prep and first charge: ~24hrs When I first purchased the phone, I read in the manual that it is "recommended to charge the battery before turning on the phone for the first time". Not willing to take any chances, I left the phone powered off and charged it to full with about 3 or 4 additional unplug/plug-in cycles (bump charging), waiting for the LED to turn green each time. I had probably low-moderate usage: couple of phone calls, couple of text and MMS messages, couple app downloads from the marketplace, mostly tinkering with the phone to get used to the interface. With all of this the battery lasted roughly 24 hrs until it completely died and turned the phone off. I'm kicking myself for not taking a photo of the up time vs awake time, but I am still learning the ways of the android OS and was unaware of this feature at the time. All said and done, 24hrs is by no means anything to complain about. Even with the little usage I had, I imagine a full day of using the phone it should last me most of the day with spending the night on the charger just like most other high end smartphones that are currently on the market. A lot of people have had battery drain issues with the phone just sitting there, but I feel the few things that I disabled were enough to help the battery last as long as it did. For the most part, the things I disabled are features that I do not wish to take advantage of 100% of the time and nor do i need to. I mean, come on, Blockbuster? I thought they were bankrupt. Second charge: 62+ hrs up time This time I decided to see how long the standby time would last with very little use of the phone. Wow, was I surprised. First some photos: As you can see the phone was about to die. I was surprised at how little battery juice was used during the first 48 hours or so. One other thing that I thought was odd was when I went to bed last night at around midnight the meter still read 5 bars on the battery meter, or roughly 45-50% remaining. When I woke up the next morning, it was down to 2 bars (15-20% remaining). It's possible I left something running that drained the last half of the battery a lot faster. Either that or the battery meter isn't an exact representation of the juice remaining. I'll know for sure once I do some more testing of the battery. Here is a breakdown of what used up the battery during this time: This photo was taken before the previous one, but I'm sure is close to the same percentages if I had taken it later. Again, remember that I am in a strictly 3G area only and wifi was hardly even used if at all. I'm sure after a few more charge cycles of my battery things will change. One other thing to note is that I still haven't performed a battery "calibration". So I am curious of how that will help as well. I'm sure once I start adding other apps and get into using my phone more regularly as well has the 4G service becoming active, things will change drastically. But hopefully by then a less hideous looking extended battery will be out by then, one that will have a smaller "hump" on the back of the phone unlike the 2750mAh one currently available. I will post other findings as I test the battery.