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had the same problem.. full charge at 12am after 8+ hours of charging..at 7am it was dead.. but when i went to work it completely charged after 3 hours and now im getting atleast 10+ hours on a charge..

maybe call t-mobile and ask if they have a spare battery for the vibrant.. i did that and then my battery started working properly... probably scared into working...haha
So your saying you had to change your battery and everything was good? Also i ordered through radio shack so i guess ill have to go there.
After some tests I lose ~12% an hour when not using the phone at all. It hasnt made it through a work day yet. I'm starting to hate this phone
Most relavent thread I could find and don't want to start another "battery sucks!" thread.
My battery usage test:
Battery 100% @ 6:30am
Battery 0% @ 2:40pm
Steady browser use w/ 3g from 7:30am (still 100%) - 2:40pm (dead)
no phone calls, a few text messages
Screen and browser brightness at the minimum.
GPS, WIFI, Bluetooth turned off.
live wall paper activated
No social network feeds etc. The only sync I had going is my gmail.
Good, bad? comments?
Wow I have had the exact opposite experience with mine... 730am phone fully charged , text, web, video, phone calls and crap loads of text messages and at 630pm battery at 59%
No live wallpapers
ADW launcher not touchwiz
Facebook and twitter sync (apps not internal)
bluetooth on the entire time
wifi and gps off