iOS 6.1.3 battery drainage

when your iphone 5 is full charged , try to reset 4 times and you ll see that once your battery will drop from full charged to 95%, or 93 %, then let it charging and you ll get real battery duration.

What you describe is the calibration needs performing. That should get it closer to being correct. The software and actual battery capacity are not in sync so to speak so the calibration should help. Keep in mind that is just an estimate.

No need to do a reset to calibrate the battery charge %. All IOS devices calibrate the battery level automatically when doing a 'deep cycle' recharge. All you have to do is let your battery level get to the point where the battery icon turns red and do a full recharge (Red % varies by IOS device from 10% - 20%). This will start a deep cycle charge mode. Apple recommends to do this at least once per month to maximize battery cycle life. The battery level will never be exact as sbailey4 says because the % shown is based on the precise voltage it reads at any given time. Battery voltage will fluctuate with temperature changes and how much current is being drawn by the device. Apple samples the voltage level every minute or so and averages the results to calculate the % to display. This is why you sometimes see a jump in the % indicated. For example if your downloading a movie the % may drop several points and then jump back up once the download finishes because of the voltage changes, the same for a significant temperature change.

That's good to know. At least the percentage reader isn't faulty. It's interesting how Apple doesn't list the maximum battery time for 4G browsing for iphone 4s. They claim it can last up to 9 hours using wi-fi, yet during my tests I turned on airplane mode and solely used wi-fi for at least half of my total usage time. Based on my tests, the battery didn't last nearly as long as they claim, given the defecit was at least 90 minutes. Having airplane mode on the whole time may help a bit more, but that's not really a viable option when it disables the phone function.

I personally think 10-12 hours of battery life while using the phone lightly should be the bare minimum, but perhaps my stats are normal for the iphone 4s. I suppose I should just hope the new iPhone will improve the battery life.

Here you go. They list 3G as 6hrs (its the same deal) ATT calls their enhanced 3G "4G" for whatever reason. Just confuses folks.

• Talk time: Up to 8 hours on 3G, up to 14 hours on 2G (GSM)
• Standby time: Up to 200 hours
• Internet use: Up to 6 hours on 3G, up to 9 hours on Wi-Fi
• Video playback: Up to 10 hours
• Audio playback: Up to 40 hours

Note the wordss 'Up to'. Talk time of 20 minutes, 1, 2 or 3 hours or 7 hours 59 minutes ALL satisfy the condition 'Up to 8 hours'. All ' Up to 8 hours means' is that it won't be more than that.

Thanks for the information, but there are certain things I'm still concerned with. I would imagine 4G would still drain the battery a bit quicker, as that network loads data on the Internet marginally faster compared to 3G, even if it is the same deal. Wouldn't it be the same thing in comparing LTE to 4G on the iphone 5? Whichever networking service loads the data quicker drains the battery quicker?

What interests me is how Apple goes about testing the battery time for certain things. They've given us numbers, but not specific information about how they used the phone while testing it. For example, screen brightness, how many apps are open at one time, push notifications, location services, etc...Those factors are unknown to us. The only thing I really have to go off of is their Macbook Pro battery testing conditions. They claim they test the battery with 50% screen brightness and casually surfing the Internet and writing in word documents. Applying that here, I simply don't see why I'm not getting up to 9 hours on wi-fi when I used my phone almost entirely on airplane mode. They can't possibly have employed any other battery-saving trick than what I'm doing, as I've essentially disabled all of those unnecessary features with my screen brightness at less than 50%. I just think I should be getting battery life closer to their projected wi-fi limit when I'm using it as lightly as possible.

4G on iPhone 4s is not LTE. Its enhanced 3g (effectively the same as 3G). Here is info on how Apple does their testing. Not quite the answers you are looking for but.........

http://www.apple.com/iphone/battery.html

I got some solid info, thanks. This just confirmed my suspicion that my battery is faulty. For the wifi tests they used default settings on the phone. If they get up to 9 hours using default settings and I only get 7 or so hours using battery preserving tricks, then there's a definite problem here. Looks like ill be paying the apple store a visit over the weekend.

FYI: Different Wifi protocols, connection speeds and settings on your router can greatly vary the battery life. Basically the older and slower your Wifi router / signal the more power is consumed.

I'm pretty sure my Internet router is top of the line, so that's not it

AmuricanPatriot - And your distance from your router is exactly the same as that as Apple's. And the surroundings are exactly the same? And any interference to your Wifi (neighbours, appliances etc) is exactly the same? And the webpages accesed are exactly the same (loading times etc)? In short your are operating in EXACTLY the same controlled conditions that Apple used when doing it's tests?

No?

Think therefore that your results may differ then?

Yeah and of course they are probably in lab with perfect conditions etc etc. Very subjective and really marketing hype if you ask me. AmuricanPatriot, can do some math and see where you stand and as stated "up to" leaves a lot of wiggle room for them.

using the specs example below:

6 hr 45 min stby

1 hr 31 min use

75% remaining

per spec 6.75/200=3% used for stdby, 1.5/7.5 wifi /3g mix = 20%, so 100%- (3+20)= 76% should be remaining. in this example 75% was remaining so very close to max spec.

Of course use the numbers for whatever partcular type of usage

• Talk time: Up to 8 hours on 3G, up to 14 hours on 2G (GSM)
• Standby time: Up to 200 hours
• Internet use: Up to 6 hours on 3G, up to 9 hours on Wi-Fi
• Video playback: Up to 10 hours
• Audio playback: Up to 40 hours

No, I'm not claiming my wi-fi connection is exactly the same as theirs during their iphone test. Interference should be minimal, as it's a password-protected network restricted to the confines of my house. I suppose distance to the router could be a factor, but I have an airport station of every floor of my house. Regardless, the differences between wi-fi connection/distance shouldn't have much of an impact here considering the disparity of the phone settings. In other words, the fact that many phone functions are disabled for me (notifications, location services) compared to the default phone settings (more notifications and location services would be enabled in the Apple test) in their test should cancel out any wi-fi network interference on the battery. That's just my view, though.

Regardless, I'll be visiting the store this weekend. Casually messaging people or browsing email in airplane mode seems to drain the battery at least 1% every 3 minutes, if not more than that. Even in sleep mode the phone loses at least 3% hourly. I suppose my battery may be displaying wear and tear symptoms after a year of owning the phone, but I suspect something else is at fault here. I'll keep updating my battery times as the days progress.

Hi. I've been keeping a close eye on these forums since suffering form the dreaded 6.1.3 battery drainage issue and I think I've finally cracked it. I downloaded IOS 6.1.3 over the Easter Weekend and on returning to work found that my battery had drained to 20% within four hours of taking it off charge. Having researched various forums over the following week I became convinced that something in 6.1.3 had interacted with my iPhone 5 configuration to cause battery drain issues. In fact I don't believe the battery was draining fast at all, rather the OS thought it was and reported it as such before shutting down when it thought it had drained completely.

I tried restoring the phone before reinstating my Apps etc. from the back up. There was no improvement and I was forced to keep my phone on charge while driving to the office and during the day at my desk.

Yesterday I read a post where someone suggested restoring to factory default using iTunes but without restoring the backed up apps and data afterwards. Instead I set up the iPhone as a new device. The only other changes I made were to setup Outlook Exchange, Hotmail, Bluetooth and my home and work wireless network settings. The battery held its charge just like the good old days throughout yesterday evening. I powered down the phone and put it on charge last night then took it off charge with 100% at 06:30 this morning.

I drove to the office without charging the phone, and it's now been exactly five hours since it came off charge and the battery level is showing 89%. Up until yesterday my phone would have died by now.

My next step will be to reinstall the Apps gradually, one by one, direct from the App Store rather than from my last iTunes back up. Fingers crossed!!!!!