Unless your rooted not much can be done except turning off data or installing juice defender like DMajor239 stated. If you are rooted then much can be done.
For the moment, what android version are you on 2.3.4, 2.3.6 with fd11 baseband or 2.3.6 with fg11 baseband?
What the unit is trying to do is continually sync your accounts, email, Facebook (if you have one), things like that plus any apps you may have are also continually trying to update.
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