Made a few phone calls, surfed the net, checked emails, connected to wifi/hspa+ and bluetooth set on. Played a little bit of games and have been off the charger since 7:20am in the morning. So far I'm at 72% battery life. What are you guys at? Currently, 3:16pm.
After a week and a half with mine, I can say the battery sometimes seems amazing, other times it's very questionable. I can say that I've not seen any of the extreme cases as described by vi_edit or others around the net, but there are definitely problems with it. I'm not quite sure if it's the phone or the OS, though.
Since I've had the phone, I have wifi enabled, NFC on, Bluetooth off, non-LTE 4G on, automatic backup on, usage statistics on, battery saver on, Exchange account syncing constantly, POP account checking every 15 minutes, Facebook and Twitter account configured. I let it run down until it turned off on the initial charge and then charged back to 100%. I didn't block background apps until about this time last week.
At its best, it's only lost 7% while sitting overnight doing nothing for 9 hours. At its worst, it's lost 17%. Those are the only times I've been able to directly compare. Sometimes, it feels like it is the best battery ever, other times I wonder why it's getting as low as it is. Today, I took it off the charger at 5pm to leave work, browsed reddit for 25 minutes straight over non-LTE 4G, downloading pictures and general comment reading, then it sat for 2 hours up to this point without being used. Battery free right now at 2.5 hours is 89%. On a bad day, that would be down at like 65-70%.
I do think this will get sorted out eventually with a patch, I'd have to imagine it's a top priority at Microsoft and/or Nokia.