IPad 3G - Battery Drain in standby mode in areas of strong 3G coverage

I'm having an issue with my 2-week old iPad 3G that I cannot seem to find reference to in this forum so I'd be grateful for any assistance that can be provided.
Despite switching off all push notifications, in areas of strong cell coverage the battery charge on my iPad 3G drops at an alarming rate whilst in standby mode (6% per hour). Switching the iPad to WiFi only and putting it into standby mode reduces the discharge rate to less than 1% every 5 hours.
I've compared the performance of my device with the exact same specification device of a colleague using the same network (O2 in the UK) in the same location (our office) and his device drops less than 0.5% charge per hour in standby mode whilst connected to the 3G bearer.
My initial thoughts are 1) faulty SIM card which is causing the device to continually poll the network or 2) faulty 3G radio module which needs replacing.
I've reset the device and conditioned the battery, all to no avail. 7% battery drain per hour limits the mobility of the device and I'd very grateful for any ideas.
Many thanks

This seems like a poster child story for the use of an integrated SIM in the next iPhone and iPad. Since this would eliminate the user having to switch sim cards and the likelihood of getting a bad SIM.
Thank you for coming back and letting us all know about your issue and your resolution.

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Diavonex: The brightness level can't be the culprint because the iPad is asleep and the screen is off.
I'm not using bluetooth. I do have wi-fi and 3G enabled though. I suppose I could turn those off each night. That would be a non-optimal solution of course, since I don't really know when the last time I will use my iPad will be, and then having to turn the connectivity back again seems like a nuisance. But it's certainly something worth trying.
Yet.. I'm pretty sure this has just started happening recently.
SteveJobsFan0123: I tried rebooting my iPad. Wouldn't that have closed all the apps? That's the reason I tried that.
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