@scapegoat: That's something that interests me as well. Compared to Symbian... well, no. There is no smartphone OS that is as good at energy management. Add to that the much lower clock speed of the E71 and there is simply no comparison.

Now, the iphone... well, that depends heavily on a lot of factors, the way you use the phone chief among them. Don't forget that the iphone has a stunted of multitasking that helps ensure that the processor gets strained as little as possible. Compared to the N9, with its full, real time multitasking... well, if you have a metric crapton of stuff running in the background that keeps the processor running on full throttle or the wireless chips sending bits back and forth (IM on standby, for example) then expect to get to be friends with the charger. It's not too different from the N900. Mine has quite excellent battery life when I don't run apps on the background and keep the IM protocols off, but when I turn them on...

Another side is the OS itself. Being linux running native code and not a runtime like android, I expect it to be quite easy on the processor and the battery. That also depends on the way the CPU scaling is set up, and what frequencies are used besides the full 1 gigahertz. Any N950 owners have an idea about this? Along with what frequencies the CPU actually supports?