Battery uses with iOS 4.2

Hi,
I have noticed a battery use issue after upgrading to iOS 4.2 My iphone and ipad battery is draining quicker than it did before the upgrade. For example, if my iphone (Model 3GS, 1.5 year old) was charged full and left idle for 24 Hrs, the charge drops just a few percent. I used to get 90-96% charge remaining after one day idle. Similarly, in ipad too, the charge will retain 85-95% if left one week idle after full charge. But after updating to iOS 4.2, the battery is draining quickly. iphone charge drops to approx 80-85% if left idle for one day and by 3rd day it drops to 20% if left idle. Similarly in ipad too the charge is dropping faster too. If kept idle for one week charge drops to some 70%. Did any one notice this? I am unhappy with this issue as it requires me to charge the devices quickly. Also the drain in charge is unreasonable as i have not used any extra feature which may use more energy.
Thanks,
N

Are you sure? I'm using 4.2.1 and don't have any battery issues with mine.
Did you check that nothing is running in the background? Some apps like Skype can still run in background even if you exit out of the app.
Also try this:
Delete your mail account by going to Settings > Mail. Once deleted, do a hard reset, by holding the home button and the power button for 10-15 seconds until apple logo appears. Then re-set up your mail account. Sometimes the mail server can get stuck.

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