Mixed bag here...
i was getting about 7-8 hrs of usage and nearly two days (6am - 10pm the next day) standby on my iphone 4 with often more juice (10-20%) to spare. fast forward to the iphone 5, that dropped some (6-7 hours usage, but getting under 10% left), but the biggest difference i noticed was that rather than losing 1-2% overnight, i now started losing 7-12% overnight with the iphone 5. (over 10 hours)
when 6.0.2 came around, the similar "standby consumption" continued, but my real usage plummeted as well. so much so (i was getting under 4 hours), that i managed to downgrade my phone to 6.0.1 to get my "normal" 6-7 hours back.
fast forward to 6.1: i am showing that i could once again get close to 8 hours usage if i used it during the span of one day (extrapolating a little), but overnight consumption eats into what i can expect to get from the phone. last night, for example, it still consumed 10% (dropped from 68% to 58%).
i'm still puzzled by all of this. i've tried reseting all settings and network settings. but those had little effect.
as far as what is consuming battery overnight, i'm at a loss and have explored a little find that it's not facetime or siri being on.
what's left?
- LTE vs 4G vs microcell : without the AT&T microcell, i get 2-3 bars at home. i have noticed that the phone doesn't always connect to the microcell 100% of the time so i wonder if it is somehow flipping between networks and draining power.
- Notifications: i "only" have: phone, messages, google voice, and calendar running.
- Location servies: only maps, google maps, siri, and yelp
- Mail: everything is set to Manual (both on each account and also under advanced -- a few gmail accounts, and 1 yahoo)
- all advanced location services are OFF
- bluetooth is OFF
- this overnight consumption exists whether or not i have wifi on or off.
- if i go to airplane mode, i find 1-2% drop in battery (which seems reasonable)
i've heard Evernote might cause a problem, so i am tempted to delete it and see what happens overnight.
anything else i should be thinking about as possible culprits? i'd love to hear suggestions.
my current path is to selectively turn the few things listed above on/off and see if they have any effect. if it weren't for this overnight consumption, i think i'd be happy with my battery usage. it's just that on light days, i hardly use my phone and it therefore should last me at least two days, if not 3. but what i find is that that 10% (a few times it was more) overnight really brings me close to running out on the 2nd or 3rd day.
perhaps a small complaint: i know the solution is to charge every night. but i'd prefer to not do so. i never had to with my iphone 4.
of course, the final step is to restore as a new phone...i guess i could do that and backup my high scores on games and also find a way to save my old text messages, etc.