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I'm experiencing this. Since upgrading to 10, my iPhone 6 has gone from being needing to be charged every 1.5 days to at least 3 times a day minimum. It also

I'm experiencing this. Since upgrading to 10, my iPhone 6 has gone from being needing to be charged every 1.5 days to at least 3 times a day minimum. It also runs extremely hot a lot of the time, regardless of how many or what apps are running in the background. No difference if I completely power off and reboot the phone. Usually within a few minutes of restart, it starts running hot and the battery indicator will almost visibly run down without me doing anything on the phone itself (and with all background apps shut off). The phone's "Battery Usage" list is useless, as it shows things like Mail being used for 3 minutes, and using 25% of the battery power since last charge. Varying apps are listed as huge battery sucks even when I don't think they are (Calculator anybody?!?) At this very moment, it is saying that Apple Remote took 26% of the battery charge, Messages took 11% and the Home & Lock Screen took 9% since last charge - about 30 minutes ago! Things that I expect to suck up the battery, like the Moves app, says only 2%. I've even plugged my phone into my PC and gone into XCode to check the logs to see if anything is standing out, but nothing in the logs point to a particular app or process chewing battery time. Immensely frustrating. Another dev friend of mine has said that the iOS 10.2 beta has fixed most of his problems, so I may download that from our developer account and see if it works. EDIT: Just thought I would point out that I have done a full factory reset on the phone and restored from iTunes backup twice now, with no improvement at all.

jeffwass 10y ago
I also had major battery issues after updating my 6+ a couple weeks ago, but somehow they've resolved now. I'm not sure why or how things got better. At first I could see the battery power dropping in almost real time. Using safari for a few mins would bring me from 90% to 80%! (Eg - more than 1% drop per minute). I then disallowed almost all apps permission to refresh in the background. But that didn't really help much. I also noticed the phone seeming warmer than usual. But I wasn't sure if I was imagining that, being biased by the quickly-depleting battery. Agreed that the battery usage tool isn't very helpful. I think it just shows which apps were used by % of time in foreground, not by multitasked allocation. Eg, this was dominated by Safari and mail for me. I also let the phone completely discharge a couple times and recharge fully. Some people say this can help condition the battery, though I'm not sure how much truth to that for these batteries. But after a few days things just went "back to normal", and I went back to getting a fully day's use of charge. I haven't changed my permissions back, so most apps remain without background execution priveledges. I haven't noticed any limitations to my productivity with this change. FYI - I basically charge my phone daily, overnight when I go to sleep. I'm usually around 20-30% when I plug it in for the night.
- cyberferret 10y ago
  Glad to hear you got yours back to normal. When it first started happening after I upgraded, I read up on it, and a lot of reports said to expect degraded battery for the first few days at least while the email app caught up and reindexed all mailboxes and iCloud did a fresh backup of up of the existing data. I have about 6 email accounts on my iPhone each with gigabytes of data, so I happily put up with the heat and battery issues for a while. But nearly two months later, the problem continues unabated. The heat is a real worry as it is too uncomfortable to have in my pocket anymore (the metal edges become almost too hot to touch), and I am wary of charging it when I am not nearby to monitor for any problems (oddly - it doesn't seem to heat up so much when charging, but I want to be 100% sure).

jeffwass 10y ago

I also had major battery issues after updating my 6+ a couple weeks ago, but somehow they've resolved now. I'm not sure why or how things got better. At first I could see the battery power dropping in almost real time. Using safari for a few mins would bring me from 90% to 80%! (Eg - more than 1% drop per minute). I then disallowed almost all apps permission to refresh in the background. But that didn't really help much. I also noticed the phone seeming warmer than usual. But I wasn't sure if I was imagining that, being biased by the quickly-depleting battery. Agreed that the battery usage tool isn't very helpful. I think it just shows which apps were used by % of time in foreground, not by multitasked allocation. Eg, this was dominated by Safari and mail for me. I also let the phone completely discharge a couple times and recharge fully. Some people say this can help condition the battery, though I'm not sure how much truth to that for these batteries. But after a few days things just went "back to normal", and I went back to getting a fully day's use of charge. I haven't changed my permissions back, so most apps remain without background execution priveledges. I haven't noticed any limitations to my productivity with this change. FYI - I basically charge my phone daily, overnight when I go to sleep. I'm usually around 20-30% when I plug it in for the night.

cyberferret 10y ago
Glad to hear you got yours back to normal. When it first started happening after I upgraded, I read up on it, and a lot of reports said to expect degraded battery for the first few days at least while the email app caught up and reindexed all mailboxes and iCloud did a fresh backup of up of the existing data. I have about 6 email accounts on my iPhone each with gigabytes of data, so I happily put up with the heat and battery issues for a while. But nearly two months later, the problem continues unabated. The heat is a real worry as it is too uncomfortable to have in my pocket anymore (the metal edges become almost too hot to touch), and I am wary of charging it when I am not nearby to monitor for any problems (oddly - it doesn't seem to heat up so much when charging, but I want to be 100% sure).