The iPhone 4S battery runs down very quickly. Does anyone else have this problem?

I'm really sorry Lawrence, but I can't find anything on mu 4s that looks anything loke 'Exchange'. Where is it?

Exchange means Microsoft Exchange, one type of Push email account. If you have a corporate email address on your phone it is probably Exchange. If not, gmail offers Exchange services, and me.com and Yahoo are also similar accounts.

If you turn off WiFi you cannot back up to iCloud or sync via WiFi. And WiFi is off when the phone is on standby anyway, so turning it off defeats many features of the phone and doesn't save much in the way of energy.

Well the chances of you needing to backup to iCloud in the middle of the day while walking around are low. I turn off my WiFi after leaving home and turn it back on when I get home at night, let it do its thing, and use it for faster browsing. During the day, while the phone is on, youre almost always encountering locked WiFi signals so you can't really connect (especially in NYC where you and I are).

Also I'm not sure the WiFi shutting off in sleep mode is immediate or not. There may be a short cooldown period fwiw

Same here.

I leave my wifi and bluetooth on all the time (have to connect to my car's bluetooth).

I also experienced faster battery drain when I first got my 4s last week. Lost 18% overnight compared to 3-4% normally with my previous 4.

So, I came here and read all the suggestions and tried most of them. The ones that seemed to help me the most (now I'm back to normal battery drainage rate).

1) Do a reset by holding down the power and home button together until you see the apple logo.

2) Turn off as many apps as you can under icloud (I only have contacts and notes turned on).

3) I do have icloud back up ON as it will only automatically back up your phone to icloud IF you are plugged in and connected to wifi. Or you can manaully start the backup by pushing the "back up now" button.

4) After doing 1-3 steps above, if you still notice faster battery drain (you should expect small increas in battery drain due to ios5 since it does more now) then as a last resort, try the restoring your device and set up as NEW in itunes.

I actually did all of above steps and now my phone loses about 4-5% over night and am back to normal.

Hope this helps.

turning wifi off aint gonna make much difference! turn off ur 3G to have an effect

@Jack, you are correct about WiFi. However, you can't turn off 3G separately on iOS 5. Even then it is a mixed savings, because, while 3G uses more power than GPRS or EDGE, it is also faster so it finishes the transfer sooner (thus using power for a shorter time interval).

I landed on this post because my battery life on my 4S is horrendous. This morning my phone was 100% charged. 4 hours later, with only mild use (checking emails and facebook occasionally) it was down to 44%.

I haven't tried doing the "calibration" (letting it run to zero) yet. I may also try reinstalling iOS5, since I suspect that is what a Genius will suggest.

I hate to have to turn off all the cool features that make the phone so wonderful in order to get reasonable battery life. There's gotta be a bug in the OS that's leaving battery-sucking processes running.

I have let it run down completely, so far it seems to go about 24hrs before it needs a recharge, althougth it doesnt drop the level that fast and most the time its in standby etc. All power hungry apps or tasks are not running, although I havent done a complete restore.

Maybe I need to get one of those original batteries that we used when mobiles were first invented? - ones that are like a couple of house bricks <LOL> 😀

I have also woke to a dead iPhone the last 2 nights despite the phone being at 80%. However th bad battery life only seems to be happending at night so far.

I took it out on the golf course and used it for 18 holes and it still had 30% left without really having to do the tricks I used to on the 3GS. But both nights ( no Wifi, no bluetooth, not plugged in) it has comepltely died. I didn't have automatic diagnostics on, but I do now because I have 2 low memory and 2 low battery reports in the diagnostics. It also shows nothing under "time since last full charge" despite me having it plugged in all day the first day. (I didn't really look at the percentage since I had that off at the time, but it is on now)

Been plugged in for an hour now and it has gone from 45% to 88%. I think my 3GS would have been fully charged by now.

We have two I phones 4s both batteries won't make it all day we appointment with apple Sunday to ask if they are defective ...can you believe that one can't get thru to phone support and takes 5 days to answer a question we have lowered the brightness we shut off blue tooth and shut off wifi when you don't need it if this doesn't work I can't plug them in body orifice back to apple so far very dis appointed with with all the hype of longer battery life fix or forget it and igot $100. Worth of accessories I am going to have to eat this is not RIGHT!!!!!

I say to all 4s owners get on Facebook this forum and tell apple to fix this problem or were all going to send them back how would they like a pile of phones at corp headquarters we paid hard earned money and all you can do is have a forum post to like you tube. you can't get thru on the phone my wife stopped at the apple store 1:50pm the store is closed a guard was posted out side all white curtains closed sorry for the incontinence BS all other store run every day working hours they just don't want to hear the problems. Tell all apple owners hear us or send the **** thing back they are a lousy excuse for a co. that cant keep work hours at a public store. Revolt!!!!! Now!!! Demand service or refund!!!!!!!!!!!!

My phone switches off at 40% and when I plug it in to charge it appears dead. I have had it charging most of the day went out for the evening and it's switched off. So I can't let it run to below 29%. When I can reboot it it says I have 37%. So I don't know why it's switching off with no warning at 40%. Any ideas ?

I have the poor battery problem. Hope a fix is released soon ...