Doug Lerner2 wrote:
Lawrence Finch wrote:
Doug Lerner2 wrote:
But if what you are saying about LTE use is true - that is uses twice as much energy in the BEST case as WiFi, then how can the advertised 80% of WiFi spec possibly be factual? Even under the best of circumstances?
Because, as I said, WiFi uses power continuously, but cellular only when actually exchanging data. Apple assumes that you are not exchanging data every second that you are using the phone. In addition, data exchange is not the only thing that uses power. Lighting the screen uses a lot of power. the CPU can use a lot of power if you are doing any sort of processing such as playing interactive games.
I just want to address this point for the moment. In the stated specs, Apple is assuming exchanging data every second I'm using the phone because it clearly states those battery times are "Internet use." Unless they want to have some Clinton-esque debate over "what the meaning of 'is' is." Internet use would imply to anybody that that is the exchange of data over the Internet I think.
As far as screen lighting and cpu, those would be the same on wifi and off. Everything else should be equal, other than whether I'm connected to LTE only or to WiFi.
Anyway, I will try a complete restore as a new phone later and test.
You say that even a forced restart doesn't kill errant apps?
I did a complete restore as a new phone just now. It only took a few minutes. And now I am restoring from my complete iTunes backup via USB. That is also going quickly.
It seems I needed to do this once when I went from my iPhone 4 to the iPhone 5. The symptoms were similar - it was running hot when on LTE and the power was draining quickly.
I noticed during the restore I was offered an "upgrade to the carrier settings." The problem may be due to an out-of-date carrier settings with my provider, AU in Japan. That seems like a probably cause.
I wonder though - why am I only told about new carrier settings during a complete restore? Why isn't this a regular update like all other updates?
Anyway, I'm taking that long train ride again tomorrow, so I'll be able to report if this makes any difference/
One aspect here maybe worth discussing:
I get the feeling that the percent numbers in Settings > General > Usage are not linear.
For example, I haven't left the house yet, and have been on wi-fi since restoring my iPhone. After the remaining battery time had dropped to 90% I used the Usage time to calculate out what that should mean in total possible Usage time and got 11.7 hours. "Wow!" I thought. This restore really seems to have had an effect!
Now the battery is at 59%. While dropping, I did the same calculation several times, and each time the predicted maximum Usage dropped more and more, the more I "used" it!
7.15 hrs <- predicted with the battery at 59%
So the "Usage" time vs battery percent appears to be non-linear and drops faster and faster as the Usage time increases.
I'm charging it back to 100% now. It will be interesting to see what happens on the train today.
Well, the restore as a new phone and then restore from my encrypted backup didn't help, like it did when I changed from an iPhone 4 to an iPhone 5.
Again, the "predicted total useage time" (based on the battery percent and the Settings > General > Usage time kept going down over time on cellular - but even more dramatically than over wi-fi:
It's obvious where the energy is going. When on cellular (LTE - full strength almost the whole time), even when not using the phone, it gets quite warm. The energy is being dissipated as heat.
It surely must be an issue with the carrier and the iPhone. I'm going to call the carrier support tomorrow. Here in Japan they provide the technical support for the iPhone anyway. It should get this warm or have the battery deplete so quickly over cellular.
I just discovered this thread. Forgive me for not reading all 103 pages, but is this a new problem related to iOS 7.0.4? Reason I ask is that my battery life was fine until recently. I can't quite identify what changed it, but about a week ago it got bad, to where I'm in the red by 12 noon. It used to last through the day—and I didn't have to turn off location services or background refresh or notifications or any of that.
I was thinking I might have installed an app that hogs location services or something like that, but then I saw that a lot of other people are having this issue, so hopefully an iOS update will solve the problem?
Doug it's not the carrier we are all on different carriers and not everyone on any particular carrier is effected.
Restoring from a backup will NOT work. Set up as new iPhone and manually add everything back from iTunes. Nothing else will work for you.
I called AU technical support this morning. They handle technical support for the iPhones they sell. They said my procedure was ok. They really think the problem might be with the radio or whatever the gizmo is that handles the cell signals.
Before trying your suggestion - which would take a very long time - I am trying one more experiment today, which is to leave it off wi-fi and just on cell usage. But I'm not going anywhere today. I want to see if somebody's theory that the constant changing of cell tower connections contributed to the drain. I don't know why that would be case though. Otherwise, the AU person said I should bring it into my neighborhood AU shop to be looked at.
But let me ask you this - why do you think manually adding everything back from iTunes (or rather the App store I presume you meant, right?) would make any difference?
i forgot exactly how long it took but something like 2-3 hours. You do it from itunes. i.e go through your list of apps in itunes and check the ones you want to add back on the phone. Same with songs from memory, or just tick them all. Then when you click sync it downloads them from the apple store for you. You dont have to wade through the store or anything trying to find your apps to download, just tick the ones you want from the list in your itunes and press sync.
This works, as unlike restoring from backup which uses a previous copy of everything on your phone (code glitches and all) restoring from your itunes account gets you fresh uncroupted content from the apple app and music stores.
The problem is a software glitch on your phone. Restoring from backup just puts the glitch back on your phone.