After 10.5.3 update the battery drains REALLY fast

I had a full battery charge yesterday and used it unplugged for 30-40mins then put to sleep. When I woke it again from sleep 8 hrs later it had no charge at all.
I know seem to get about 40mins of power before it's low on battery.
For comparison, I used it for 2hrs the day before on a train journey so it's not the natural deterioration of the battery.
Also, the fan now seems to come on a few minutes after turning on and I haven't yet started doing anything intensive.
Anybody else experienced this problem?
Thanks,
Oscar

Welcome to Apple Discussions,
Try this and check.
Before you start with the reset, connect your mac to a power outlet. Do not use battery power
*Resetting PRAM and NVRAM*
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
Resetting the SMC can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so forth. If your computer still exhibits these types of issues after you've restarted the computer, try resetting the SMC.
To reset the SMC on a Mac Pro:
1. From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
2. Unplug all cables from the computer, including the power cord and any display cables.
3. Wait at least fifteen seconds.
4. Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer.
5. Press the power button to start up your computer.
Hardy
Message was edited by: itsmehardy

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