How to resolve battery drainage for 3GS on iOS 5.0.1?

I just bought a iphone 3GS from eBay. The seller upgraded it to iOS 5.0.1. It is working except the battery will decrease 10% every hour with aiplane mode on and I am not using it at the time. I attempt to downgrade it from iOS 5.0.1 to 4.3.3 using some jailbreak methods but failed due to I do not have 4.3.3 SHSH blob.
I have a iphone 3G with iOS 4.2.1 (non jailbreak) which can hold a fully charge for a few days with airplane mode off.
I suspect it is the firmware iOS 5 and up that causing the speedy battery drainage. Any help will be appreciated. Thanks !
Philip

An update on this.
I traced the battery issue on having PUSH enabled for my old Exchange account.
Note I still have another exchange account + yahoo + icloud + gmail all with Push enabled, and the battery is perfectly fine now.
So the whole issue seems related to a recurrent synchronization problem. However it is hard to diagnosis this when the only entry on the log remains the 2s recurrent phone-global message:
Client[com.apple.persistentconnection[dataaccessd,54]] is telling PDP context 0 to goactive.
I agree one must hide technical complexities in the name of user friendliness, but adequate (deep) error reporting remains important ... at least for those users that the technical know how and will to dig deeper.

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