Same thing happened to me tonight... I've never had problems with battery before, usualy I lose 1-2% during the night. When I checked usage, it was weird: Usage: 8 hours 20 minutes, Stand By: 8 hours 20 minutes
My phone was on flight mode during the night, as usualy.
I haven't done anything about it yet, but if anyone has any idea why this is happening and what might help, please tell
I turned off a few Notifications and it seems to be helping.
I turned off: Reminders, Gmail & Facebook.
I bet it's "Reminders".
Right now I'm at: Battery 82%, Usage 1hr 32mins, Standby 5hrs 46mins
The usage was all on 3G. 2 10 min phone calls on bluetooth. A few texts and emails. Listening to a podcast for 30mins. Seems much better now.
Well, I'm still having overnight usage for some reason.
Last night as I went to bed: Battery 60%, Usage 4hrs 4min, Standby 9hrs 3mins
This morning: Battery 43%, Usage 8hrs 29mins, Standby 17hrs 39mins
So over 8hrs I lost 17% battery and increased usage by almost 4.5 hrs. ***??
What is going on at night?
I think I figure out my battery draining / high usage issue overnight.
Turning off all Location Services makes the battery last.
Night 1: Battery 35%, Usage 3hrs 30mins, StandBy 13hrs 45mins
Next Morn: Battery 27%, Usage 3hrs 42mins, StandBy 20hrs 31mins
Night 2: Battery 69%, Usage 1hr 57min, StandBy 11hrs 23min
Next Morn: Battery 63%, 2hrs 10 mins, StandBy 20hrs 34mins
The Location Services I had on were: Camera, Maps, Siri, Weather, Find My iPhone
Pretty sure there must be a bug in Location Services or one of them that causes high usage and batter drain.
This is bad. Thanks Apple for a good product, but fix it.
Another update. I think I found my "during sleep usage & battery drain" issue.
I turned on Location Services like David has on. I left "Find my iPhone On", but went to "System Services" at the bottom of Location Services.
I turned off everything except Traffic and Cell Network Search. And my battery is great, as is the usage.
I'm guessing "Diagnostics & Usage" is the culprit.
Last Night 11:58pm
Battery 92%, Usage 26mins, StandBy 2hrs 31mins
This Morning 8:15am
Battery 86%, Usage 38mins, StandBy 10hrs 48mins
So 6% over 8 hrs, which is my best so far. Yay!
Email is on Push, Notifications are on (weather, phone, messages, calendar, mail, reminders).
Location Services is on (camera, maps, weather)
The 4s has a LOT more going on.. and apple needs to tone down what's running on the os OR put in a better battery... LOL..
plus you can't shut off 3G... I found a way to save batt life is to KILL all system based location services.. and they put my life back to normal... normal apps can still use location services fine... I then turn them back on when im on DC power.. I'm sure 5.0.2 or 5.1 will fix them..
in the meantime you can kill the 3G switch to help save life too: