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In order to bring some objective observations to this thread:
I just completed a 24-hour test with my phone, standby-only:
-3G on the entire time.
-Wifi on and connected the entire time.
-Push e-mail active (1 IMAP gmail account attached, 40-50 emails received via push during test period)
-Push notifications active (the screen popped up 30-40 times with friends' foursquare checkins during test period)
-All apps closed out of multitasking menu.
The result: in 1 day 0 hours of standby, the battery went down only 22%, to 78% remaining (see picture). This is very comparable to how my 3G, 3GS and other iPhone 4s have behaved, and is what I believe is indicative of how the phone should behave, while NOT having a phantom drain problem.
A quick caveat: Normally I test standby-only with zero usage at all. This time, I actually had about 45 minutes of usage during the 24-hour period - a few games of Angry Birds, taking and emailing 3-4 medium-sized pictures, recording a 10-second video clip, returning 3 SMS, and making three short calls. If I had true zero usage, the battery would have ended well above 80%.
When I performed this test last week with only the MobileMail and Settings applications active (and unlike above, with true zero usage on my part), I had 48% battery remaining after 24 hours of standby. That's a 52% drain after one day, or over 2% drain per hour, with the phone completely dark.
But let's not talk about "well over 80% remaining" since that's not what this test showed, and let's hedge it even more than what the actual numbers do show, and say I ended this test with 75% battery (whereas I actually ended with 78%) with zero usage. This still represents an over 2x battery performance increase over having the MobileMail app in the background. Whereas I would have gotten fewer than 2 full days of standby before, by closing the app I get more than 4 days standby. The last time I ran this test, I had 85% remaining, which would translate to more than six days of standby.
First, this isn't "normal" usage, whatever that means. I don't expect to have 80% of my battery remaining after a regular day of using the phone. But the problem many people, including myself, have been experiencing is phantom standby drain, so that's what I'm testing here; trying to eliminate as many random factors as possible and just get a quantifiable, repeatable metric.
Second, others have said that it's not necessarily the MobileMail app. I can totally believe this. I don't know what exactly causes the issue, but I do know that for me, having MobileMail in the background can trigger it. Maybe other apps can too. Maybe for some people it can happen without any apps in the background. Maybe for them the drain is permanent, and doesn't go back to normal even with all apps closed (which would explain why some people have said that I "shouldn't expect my iPhone to get any better than 50% battery remaining a day with push e-mail turned on"). My last iPhone 4 had 12-15 apps in the background at all times and never exhibited this problem. All I know is that for my current iPhone 4, it seems something is causing phantom usage and battery drain while on standby if I have some apps sitting in the background.
Third, again, this suggests that it's not a hardware fault, so whether getting a replacement phone, doing some hard DFU reset, restore or whatever makes a difference (I have no idea), the ultimate solution is likely to be a fix in software.
Until that fix happens, I'm just going to be closing out of apps before I sleep the phone, despite Apple's assurances that apps will sleep in the background.
I'll try to answer any questions that I can.
I've just spend an hour reading all the previous posts. I am having the exact issue as most have reported. Just can't seem to pin point to what's causing this insane battery drain. I got this phone on launch date and it came with 4.0. Didn't get to use it with a sim card inside at first so I can't confirm whether it was better on 4.0. Once I upgraded to 4.0.1 and immediately jb and unlocked, the battery has been abysmal. Some say it's 4.0.1's firmware, others say it has to do with the current jb.
I have push mail on, using gmail's ms exchange and i have 6 business imap email accounts on fetch. I've had fetch set on 15mins, 30mins, 1 hr duration, and manual fetch. It doesn't seem to make a difference. I've been using the exact configuration on my iphone 3g previously and even that phone can last 2 days after a full charge. Turning off push and set all emails to manual is not a solution, it's a big compromise that should not happen, seeing as how I get better battery performance from my 2 yrs old 3g doing the exact same thing.
After charging the phone to 100% the previous few nights, I too notice about a 20% battery drain when I wake up in the morning (roughly 6-7 hrs later). I saw a post by Flamehearted about doing a reset warning on the IP4 in tunes. Basically, connect your phone to itunes and right click on the device and reset warnings. Sync and you should be prompted with a message that ask if you want to transmit data to apple, choose never, perhaps this has something to do with the phantom usage. Currently testing this out using edge, with gmail push on, and all other email accounts on 30 mins fetch. Has anybody tried this and see any improvements?
I might give isoToxin's DFU mode restore a try if this fails. Maybe the new 4.0.2 addressed this issue somehow... But then again I can't test it until the jb is out for it on IP4.
It probably is software based but last night I noticed a considerable drop in % on standby - 15% drainage and that was post the last restore!! This to me, is unacceptable especially while not in use. I have a Genius bar booked for Saturday and 4.0.2 installed in case they 'tell me off' for not having the latest software update even though this release is insignificant to my (our) problems. Will report back.
I have an astonishing story from my friend who, smashed the back screen on his new iPhone 4.
He's booked a genius appointment to get the issue resolved and in between the smash and the appointment (today) he left the phone sitting on his desk idling with good reception/signal. He has reported as having 14 days, 20 hours standby with 4% battery remaining - wifi on, 3g on, push on (receiving mail through wifi), location and notifications on but no bluetooth. The usage stat sits at 14 hours 35 minutes but hadn't used the phone after he put the sim card into his iPhone 3G and used this as a replacement phone so this seems a bit suspicious. The iP4 has iOS 4.0 installed from when he received the unit direct from O2 UK - week 28 build, factory 87 (mine is week 27 build, factory 82) - and had not upgraded to 4.0.1 as he didn't receive any antenna or proximity issues.
To me, this is a phenominal result and indicates what the battery should be reading and, in line to Apple's publicised testing results of 300 hours on standby. OK, so he hasn't used the phone in that time but with those stats he hasn't seen any abnormal % drop while on standby even connected to wifi and 3G which is what I would expect. When he did use the phone (before the break), he said his % would deplete by 1% per every half hour to three quarters of an hour with normal to medium use - calls, texts and surfing with some gaming. A lot of the time it was on standby when he took it to work.
This, I have to say, is an eye opener to me and feel that we in the minority should have at least something better than what we are experiencing at the moment. His only fear with his appointment is that they do not replace the handset.
edit Ignore this. It's to fix a standby batt prob with the previous version of this tool. Not relevant. Sorry.
I just noticed on a certain twitter feed from a certain group of iphone hackers the following announcement which I believe may be of interest. I've replaced the names of the hacks and the package manager in case apple decide to censor the post from the forums, but it's the actual detail that's important.
"xxxxxx upgraded to version 1.1-1 we've tweaked a few things that may help with standby battery life, you can upgrade via xxxxxx."
So there is at least one group of people working on improving standby life. I wonder if this was done in response to complaints or not. Maybe this problem is becoming more visible and is more widespread than apple think. Either way, if a 3rd party is optimising standby battery consumption, then hopefully apple themselves will be able to make tweaks too.
Message was edited by: isoToxin
hi there, i have had my iphone 4 for just over a week now and am not impressed with the poor ppor battery life. when i first got it the battery was charged and lasted for a long time. i let it drain completely and then recharged and now im lucky if it lasts a day.yesterday i went to work at 2pm i was fully charged, i left in the car and didnt use it until 10 pm by then was at about 40% even less after sending 2 text messages. will apple fix this???
so frustrated already
hi there on this battery issue i charged my phone last night to 100% i have wifi off, no apps running, but have 3g and data turned on, reset usage stats........this morning i bring my phone out of standby and get:
usage 31 mins
standby 13 hours 43 minutes
where is the usage coming from? i havent used the phone at all for anything.....
this is my first iphone and i would of thought in standby surely it shouldnt use 12% of the battery overnight or show any usage at all?