Battery drops on 3G activation

Hi to all,
From a month I have a strange problems.
With iOS 7 my battery life start to be a bit poor... In first time i thought it was an intense use of whatsapp or fb messanger or many notifications.
But the phone last about 5 hours of activity and 8-10 of standby.
Now I've update to iOS 8 and the battery is getting worse. (restore in DFU mode as new phone)
Now the battery last 2-3 hours and what i've found out is that if I activate the 3G the battery drops immediately...like today i have had 87% of battery life and after just activate 3G it drops to 35%...
I think its not normal...
Do I have to replace the battery? or maybe its a software problem (ios 8 bug?)
oh and I also recalibrate the battery but the problemi is there
thanks a lot in advance

I suffered the same problems until I read some of the helpful hints on some other discussion lines. My phone was discharging completely in about 9 hours after the upgrade but one simple hint seemed to work.
Basically the solution that worked for me was to reboot the iphone i.e. hold the sleep and home button simultaneously for about 10 s until the apple icon appears on the iphone.
So for those tempted to install OS4 the strategy is:
(a) install itunes 9.2
(b) connect thephon to the computer
(c) install OS4
(d) after the install is complete and itunes has finished with the phone
dusconnect it from the PC.
(e) put the phone in sleep mode
(f) recharge the phone
(g) reboot the phone
After doing that (tho in my case betwen step (e) and (f) was 18 hours and it was two recharges not one!) the phone battery should be restored to normal (<5% drain in 12 hours since midnight).
Some discussions suggest it might be the location finding functions causing the power drain. That wasn't the case for my set up as location functions were off and remained off during the battery drain phase. I have also left multiple apps 'live' since the reboot with no excessive power drains.
A clear indicator that the power drain is back to normal is the phone's temperature. It was quite warm to hot during the post OS4 install and discharging quickly, but after a post-install phase reboot (g), some 18 hours after upgrading the OS4, the phone started to cool (slowly). Some 2 hours post this 2nd reboot the phone was at normal ambient temp (cool to touch - it is winter in Melbourne after all!).
All this suggests to me that the automate reboot during the OS4 install isn't sufficient, and a manual reboot with the phone not connected to the computer (in my case a ASUS laptop running Win 7, and Itunes 9.2) is the solution for the present.
Nil Desperandum!

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