Iphone 4 Battery life Terrible (34 hours standby?)

My iPhone 4 battery went from 100% charge to 43% in 90-minutes - It was only in standby mode. The phone became VERY HOT, especially around the edges. I called Apple Care and they said "Do not use the phone because it could be hazardous" and advised I go to an apple store. I did, and they exchanged it. While I was there, someone else was there exchanging their phone for the same reason - They have a secret stash in the back in small black boxes, just for this reason. Anyway, the phone rep at Apple confirmed to me that there is a battery issue with the new phones.

I too am getting abysmal battery life: losing 20% per night in standby - absolutely ridiculous. I'm doing my 2nd battery cycling in the wall right now. If this is not fixed, I'll be going to the Apple store. Question: do you have to call in advance? Do I bring everything (earbuds, charger, case, etc.) or is it just a phone<->phone swap?

My phone was also hot, maybe the third day, but I never got the temperature warning. I know there is a relationship between getting too warm and battery loss.

to sansquantch, make an appt at the genius bar online by going through the apple site - at the bottom is a locate stores option. With the i4 problems (and I do love the screen), you must have an appt. Don't know about whether to bring everything but to be safe, I would. Good luck and let us know what happens.

Ah dang, I just created a new topic. Thanks for your advice, I'll bring everything & I'll make an appointment as well.

I have absolutely no problems whatsoever. This phone is amazing! At least mine is. I am sorry to hear that so many of you are having problems. I haven't charged my battery in 2 days, and I have push on, wifi on and full bright screen and I have about 35% battery power. I will put it on the charger tonight. I usually throw it on a charger every night, so battery life is really no issue unless I am traveling and gone for a time where I can't plug in.

I hope everyone that is having problems, gets there issues resolved right away, because this is the best phone I have ever owned. It's mind blowing!

My battery life was really bad the first and second day. I took some advice from here and drained the battery till it shut off then charged the phone up to 100% with the wall charger. It is now sooo much better! I have been using the phone heavy all day long 6am - 10:30pm, and I have only used 60% of the batter. Much improved after draining and recharging the battery!

Good to hear that! I'm going to run my phone through some cycles as well, I suppose. I did 1 cycle when I got it, but the battery life was terrible. Maybe 2-3 more will sort things out.

Mine has been better than my 3G. I charged it all night but I shut it off when I go to bed. I am on 3 hours 30 minutes usage and 14 hours standy and I am 51%. My 3g would have been dead by now. I had to have a backup battery case for it. I don't have blue tooth or push on. I just manually check for email when I want to. As long as it gets me through the day I am happy. The first day I used it a lot, but didn't check usage and it was on from 5 am to 7 pm and I was down to 15%. The second day it only went down to 40% in lighter usage. I will try and run it down farther tonight so it will take a deeper charge. Not sure why anyone would want 300 hours of standby. The phone is to be used and even with light usage you probably can't make it two days without a charge. I've always charged mine up every night and left it on the charger.

I was experiencing the exact same problem. I think my calculations put my standby time between 29 and 34 hours also. I recalibrated the battery, no luck. Restored the phone, no luck. Called Apple tech support and told the that I would lose like 30+% of my battery over night and like 2% while on the phone with them (not using the iPhone for the call!), and they set me up with an appointment at my local Apple store. I went in, they ran a diagnostic on the phone, apparently witnessed the extremem battery drain and replaced the phone. I brought it home, restored it with my backup and fully charged it. Used it down to about 82% power and went to sleep. I purposely did not plug it in over night to charge to check the drain, and woke up this morning with 79% power left after 6 hours!! WAY WAY WAY better than what the original phone was getting. I'm thinking there was some bad run of batteries in there. What makes me think that is I had the phone shipped to me, and instead of having an initial charge out of the box, it was stone dead...

Hope this helps and good luck!

I can confirm along with cadstypesh that when I received my phone (In-store pickup here in the UK) that the phone was stone dead, whereas some of my friends collected theirs and had 90%+ of battery

I've tried everything, recalibrating the battery, restoring etc. Woke up again this morning to it totally dead, currently trying a wall charge but if that doesn't work i'll trek up to an apple store tomorrow.

So annoying