Currently Being ModeratedNov 16, 2012 7:44 AM (in response to Lynsey 1984)
Look around in the settings. With the iOS upgrade, a lot of things defaulted to on - such as notifications. Y ou may have things running that you don't even realize are running.
You may also want to see if your mail is set to push rather than fetch. Push means your device is constantly reaching out to check for mail, fetch means it only looks when you tell it to. Fetch is more battery efficient.