Why does my iphone die so fast?

It lasts for like 2 hours when i'm doing nothing at all

That used to happen to my phone.
I went on itunes
backed my iphone up
reset it to factory settings
then restored it from backup
it worked
I never found out why it died really fast but it worked

This is why. Hope it helps
http://www.payetteforward.com/why-does-my-iphone-battery-die-so-fast-heres-the-real-fix/

Turn off the Wi-Fi and the Bluetooth. These drain batteries. Also make sure the display isn't constantly alight, set to say 15 seconds.

If you have ios7 there's something called background app refresh. Your phone is essentially running many programs in the background and they are actively using data and processing power to keep updated. This eats up a lot of battery. You can turn this off by going to:

Settings > General > Background App Refresh

Either turn it off completely or select which programs get to use it.

Another easy fix is to turn your brightness down and turn off Bluetooth or Wi-Fi when not in use. Use Wi-Fi when available as well. This is less battery draining than cellular data.

For more tips visit:

http://gizmodo.com/...com/how-t…

Either

1. The battery is almost dead; lithium ion batteries do not last forever. Their ability to hold hours and hours of battery life is weakened every year.

so the more years u've been using the iphone, the less battery life it has.

2. Or your iphone is getting old. You need a new one. What about taking it to apple + have them check it?

they will tell you what the issue is

(i'm not an expert)

but I CAN say that if the battery lasts only 2 hours when you're not even using it it has to be a dying battery issue.

There have been battery problems since the last update.

To fix:
1. Do a full backup - I can't stress this enough! Turn off auto sync in iTunes. Check every app to make sure it will backup if you need it's data saved.

2. Restore to factory with iTunes.

3. Restore from backup.

If this doesn't improve things, you may need a new battery. After a couple of years the battery may not recharge anymore.

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