Did you guys see that there is a 1800mAh battery option for the N810 if you don't want the extended size from the 3600mAh? I believe Benson might have been referring to a link that someone else posted for the N800.

But, here's the one for the N810

It's only a 20% increase over the 1500mAh battery that comes with the N810 but it's better than nothing.