The Vibrant is like any other smartphone, it can be a battery hog or not, much of it depends on your location, your setup and your usage patterns. I had an iPhone and at first I could only get a day
maybe out of it. By the time I got rid of it I always got 2 days, sometimes 3 out of it. I can almost always get 2 days out of my Vibrant now, whereas when I first got it a day was about max. Today is a couple of hours into day two for my Vibrant and it is at 48% and I used it quite a bit yesterday. How do I do it?
1) I use a black background, not a live background. The screen is naturally black and takes light to show anything. If you keep the number of things it has to show minimal, it will pretty dramatically extend battery life.
2) Keep my screen at minimum brightness as much as I can. Indoors that is always. Outdoors I do have to turn it up. To do that you have to manually do it not just use the auto settings. Fortunately the top slider bar for brightness makes that easy on our phones.
3) Make sure your running programs have polling set up correctly. Email can be constant or periodically. I have email set to poll (update or sync) every 30 minutes. That seems to keep me reasonably real time and cuts power consumption a lot. Facebook or twitter if you use them, set them to manually update. If you are getting real time updates your 3G is running constantly to sync and it takes a lot of battery to do that. If you need it, fine. If you don't throttle it back and you will be amazed at the effect.
4) If you really care about max battery life put your phone in 2G (GSM) mode. That takes less battery than 3G period. If you need the speed of 3G, well do it but accept the 3G power hit. If you are in an area of spotty 3G, it will stop it from searching for 3G and that will really make a huge difference. I live in a large metro area with good 3G coverage so I usually leave it in 3G at home. But I could get an extra day if I did put it in 2G here too.
5) Turn off power drains like BT, GPS or WiFi when not using them. They suck huge amounts of power. I put watchdog lite on it (available in Marketplace) and I watch power usage. If an apps sucks too much power I ask myself if I want that feature or not. If its "nice" but I am really not using it I kill it. We have a pocket computer. It needs power to do all these things it can do, but they do not have to do it all the time. That is your choice.
I went on a motorcycle trip camping for 4 days with no power. I got those 4 days out of it doing that plus putting it in airplane mode when I was not actually using it (particularly if I couldn't hear it like on the bike or overnight sleeping). I would turn off airplane mode, sync email and make a call of two and then put it back in airplane mode. It still had quite a bit left when I got home. Of course I was aggressively managing power consumption to do that, but I needed to if it was going to make it.
Bottom line is the phones can be battery hogs, but they can be managed to give better life than seems possible. It takes some thought and trying different settings - of course all dependent on your values on features. Choose wisely...
I love this phone, but the battery life is unacceptable. I don't know how other smart phones are but this is just ridiculous. I don't use my phone a lot throughout the day, but If I were I would never keep it. My phone lasts about 10-12 hrs after I unplug it at 100%.