I actually think my battery performance is a little worst on PR1.3.

My battery drops from off the charge 100% in the morning, to around 80% by midday, and that's without any use at all and nothing fetching data etc.

I can never quite understand why the N9 battery perfomace can't rival that of my ageing E7 which has a smaller 1200mAh battery. Guess Symbian is just better optimised? Often use my E7 for a few hours of satnav per day(usually in power saver) and by the end of the working day it's around 70%, often around the same as my N9 even if I've barely touched it all day

I still hope we may see some further improvements/optimisation to the battery perfomance at some point, as Lumia 800 users apparently did, it's about the only thing I'm not so happy with.