I have a Dell E6400 and have been using Ubuntu on this machine for just over a year. Previously I used 9.10 on 32bit. When I upgraded to use 10.04 I remained on 32bit and battery life seemed just fine. I changed to 64-bit and since then I get the "battery life is old" notification and the battery just doesnt last more than 20mins even with a full charge.
How would I tell which application is draining off the battery? Also is this a known issue?