iPhone 4S battery

Thanks much, I'll try that.

My brand new iPhone 4S battery drained over 30% overnight! I turned off most notifications and Siri. And only a few location services (eg. Find My iPhone) are on. And it's still doing that. Disappointing.

Do you perhaps have an Exchange account? Or an iCloud account and a large contact list? In either case the battery will contribute a lot of power to the initial sync. I'm not sure what you were expecting, but the iPhone is not a flip phone with a week's battery life; it is an extremely powerful computer that can also make phone calls. And it uses power like a computer. I suggest charging it every night so it is fully charged in the morning. If you are an average user you will end the day with some reserve, but probably not enough for a 2nd day. See the specs and compare them to your usage; if you don't get close to the specs post back and we'll help you figure out why. BTW, it isn't location services; that's one iPhone myth. Others are WiFi, BlueTooth and Siri. None of these contribute significantly to battery drain, and, in fact WiFi will extend battery life if it can connect when you are using the phone.

Battery specs:

• 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

If you follow a lot of people Twitter notifications can easily use up the battery quite fast. Each Notification turns the phone on for about a minute.

I really appreciate your help, Lawrence. I have already synced my large list of contacts for my exchange account and my calendar data for my iCloud account. So I don't think that it is still doing large amounts of syncing.

Right now, I must charge my iPhone overnight, otherwise there will be no way that it can last the next day. The weird issue is that the battery drains itself without me doing anything with it. If I have it charged at 100% before I sleep (without having the iPhone plugged in overnight), it will be at less than 60% the next morning. My iPod touch surely didn't do that. I think this is very abnormal.

My iPhone doesn't match the given specs at all. I talked for 20 minutes in Toronto with another cellphone, and my battery went down 11%. Standby time is definitely not 200 hours. Regardless of what tasks I do with my iPhone, the battery specs are much lower than the specs given by Apple.

I do have push enabled for my mail and contacts for my exchange account. If it's not location services or notifications, what can it possibly be?

Several notes: If you have an Exchange account it will consume power whether you have Push on or off. The amount of drain will track very closely to the number of messages you get. On a weekday when I receive 100 or more messages my battery starts at 100% and ends the day at 20-30%. On a weekend, when I get very few emails, it ends the day at 70%.

Standby time is meaningless, because the phone is never on standby. The mail daemon is always running, and any app that gets notifications will wake the phone to process them. And some apps as well will run in background. You can try disabling Ping, iTunes Store and Game Center by setting Restrictions on them if you don't use them. A number of people have reported that this helps.

My phone seems to track the specs pretty closely if I use the Usage figure in Settings. One way to know something is abnormal is if Usage time equals Standby time. This means there is a runaway process somewhere on the phone.

Try this:

Disable Diagnostic & Usage Reports

Tap on “Settings” > General > About > Diagnostic & Usage > Don’t Send