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Could you describe your usage? It would help. Thanks a lot! :)

Well I text quite a lot. Check the news couple of times a day. Go on Facebook and 9Gag quite often. When I'm bored I play some stupid game from the app store. Nothing very intensive that could drain the battery so much. Today I had around 3-4 hours of usage because I left cellar data on all the time because it was needed also had to use Apple Maps a bit.
 
I suggest you do this:
Make a back-up on your Mac/PC in iTunes. This copies ALL your data (Here is a list ). Than wipe the phone with iTunes. Now you have a clean copy of iOS 8.2 install the apps you normally use from the App Store. Use your phone for 2-3 days. See how battery life is now.

For backing-up: https://support.apple.com/en-us/HT203977 (English)
https://support.apple.com/it-it/HT203977 (Italiano)

For deleting everything: https://support.apple.com/en-us/HT201252 (English)
https://support.apple.com/it-it/HT201252 (Italiano)
 
I suggest you do this:
Make a back-up on your Mac/PC in iTunes. This copies ALL your data (Here is a list ). Than wipe the phone with iTunes. Now you have a clean copy of iOS 8.2 install the apps you normally use from the App Store. Use your phone for 2-3 days. See how battery life is now.

For backing-up: https://support.apple.com/en-us/HT203977 (English)
https://support.apple.com/it-it/HT203977 (Italiano)

For deleting everything: https://support.apple.com/en-us/HT201252 (English)
https://support.apple.com/it-it/HT201252 (Italiano)

Mh, I think my battery life would improve thanks to this method even if I didn't have a software problem in my backup. When you make a clean install with just a few apps and data, it's normal the battery lasts way more. The problem is making your battery work well with a decent amount of stuff on your phone (which should be normal...).

That's my last result, with a lighter usage (50% 3G, 50% Wi-Fi).
 

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Mh, I think my battery life would improve thanks to this method even if I didn't have a software problem in my backup. When you make a clean install with just a few apps and data, it's normal the battery lasts way more. The problem is making your battery work well with a decent amount of stuff on your phone (which should be normal...).

That's my last result, with a lighter usage (50% 3G, 50% Wi-Fi).

That usage looks pretty good for an iPhone 5. Much better than what you were getting before.
 
That usage looks pretty good for an iPhone 5. Much better than what you were getting before.
Yes, I disabled mail fetch (just push and manual now), transparency and motion; and my usage was lighter today. But when I use my phone, especially outside, it doesn't go beyond 3 hours of usage... that is annoying.

PS: as my tests revealed,manually disabling cellular data while at home (With the phone connected to Wi-Fi) improves battery life a lot, especially while the phone's on standby. Why? Shouldn't it stay connected to the wifi network even when it's on standby? I suspect it goes on 3G after a bit, that's why it drains. Anyways, it drains while I am using it, too... Disabling cellular data improves my battery life by at least 25%...
 
Yes, it should remain connected to WiFi and not connect to cellular for data. You could tell by watching your cellular data usage.
 
Yes, it should remain connected to WiFi and not connect to cellular for data. You could tell by watching your cellular data usage.
I left the phone on a table for 2.5 hours and it used 75 KB of data (Exchange and push). This means it used the 3G and not the Wi-Fi only (in fact it went down from 85% to 80%). Is this normal?
 
PS: if you keep your cellular data on while using your wifi network, the phone will drain more battery, since the 3G antenna will be uselessly on all the time.
 
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