My Thunderbolt's duplicitous battery life
I apologize ahead of time for the length of this post. I include a lot of details in the hopes that i might help other who are suffering through poor battery life on the Thunderbolt.
When I got my Thunderbolt, I didn't have high expectations for the battery life. For the first three weeks of owning the phone I got about seven hours of battery life. I'm a moderate user at worst and left it on 4G all of the time. I used a task killer and Lookout. Turned GPS and Bluetooth off when I wasn't using it. Two non-Gmail accounts synced at 30 minutes and an hour. I turned the screen brightness way down too.
About a week and a half ago, the battery life took a turn for the worse. I wasn't even getting three hours out of it in standby. I didn't make or receive any phone calls Messaging was minimal. Tweetdeck was set to refresh at an hour. I uninstalled my task killer and Lookout. Set weather to update manually. Checked my signal strength. Was baffled by those claiming to get several days of battery life on a stock battery.
After calling Verizon, they sent me their tips, all of which I was following except for toggling the 3G/4G on and off. Reluctantly I set my phone to 3G. Reluctantly because, I paid for a 4G device not a 3G device with 4G occasionally. Instantly my battery life improved. I got through the day with 90% remaining on the battery. I charge my phone every night. When it is on the charger I toggle the 4G on. Why? I have no idea. It is a neurosis I suppose. It is probably the same reason I logged the battery percentage by the hour later that week. One day last week my Thunderbolt restarted on its own. The first time that I am aware of it doing it. The reason I mention this is because I had read that sometimes when the phone restarts on its own it is updating something. I'm not sure if that is a conspiracy or not. After the restart, I noticed that Lookout was still installed. So I uninstalled it (again)
The following day, when I took my phone off the charger, I forgot to toggle off the 4G. Three hours after taking it off the charger I remembered that I hadn't toggled it off and I was expecting less than 33% on the battery life. To my surprise, the battery was still at 95%. So, rather than turn off 4G, I left it on to see how long of a battery life I could get out of it. By the end the day I more than 80% left on the battery. Again, I'm not a heavy user of the phone (or any mind-altering substances). For about four days I got great battery life. Then the battery started to tank again ... and I was sad again. However, after I was done crying, I check my phone to see if anything was amiss. I hadn't installed any new apps. Updated a few, which I immediately regretted. As my battery drained and I could only helplessly watch, for some reason (probably the only thing in my life that could come remotely close to a stroke of genius) I decided to restart the phone and the battery which was at about 75% was down to 65% when I put it on the charger about five or six hours later. Today, I am pleased to report that after taking it off the charger six hours ago, my phone still retains about an 80%.
I cannot explain why the battery life has so greatly improved. I can only imagine that there is something that turns on and runs constantly if the phone is left on for too long. It makes sense to reboot the phone every once in a while. They are small computers and I've noticed if I leave my computers on for long periods of time, they get cranky. For those who don't, I would suggest restarting your phone every few days. I cannot guarantee that it will work but it did for me. For me it may have been a software issue. For other it could be a software and hardware issue. As someone mentioned it could be the battery itself.
I hope this helps.