I have the same problem
Just to let you know I have the same problem/story.
My 1st 7290 gave fatal errors - Cingular sent me a new one - New phone works great but battery runs dead half way through the day.
The only difference that I notice is that when I talk on the phone sometimes I hear a lot of static/buzzing and when this happens the battery drains very quickly. However, if I go though a day with no static/buzzing the battery seems to appear back to normal. Also the more drained the battery gets the more static/buzzing I hear.
Bizzare huh? I'm going to try a new battery first, but the current battery I'm using is only 8 months old, so...
I'll keep my fingers crossed.
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