Battery life jumping on iPhone 5 ?

Hello all. The battery life on my iPhone 5 doesn't go down by 1% percent for some odd reason. It will hang on a percentage say 70% and then when I've been using for about 20 minutes later I'll be using it and it will suddenly drop to 59%. Why does it do this and how can I fix it ? Yesterday walking home it had 44% and it suddenly dropped to 11% and then a couple of minutes later powered off. It did this in iOS 6 too as well as 7. How can i fix? Thanks:)

No i do not have LTE network access at home.
My cellular reception is quite good at home as well as work.
Yes i am using an exchange account, gmail.
This is what i have tried..
turning off SIRI, auto adjust brightness, push messages, notifications, blah blah blah...
Seeems like deleting and adding the mail account once again helped, as i am experiencing a better battery life today. I had read about this somewhere but weired that this could be a solution to a battery drain issue.
But still I am planning to take the phone to a store to get its battery checked.

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    D

    Hello there, EdisonGurraj.
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    iPhone: Hardware troubleshooting
    http://support.apple.com/kb/ts2802
    Speifically:
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    Connect iPhone to iTunes and restore iPhone.
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    No i do not have LTE network access at home.
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    Yes i am using an exchange account, gmail.
    This is what i have tried..
    turning off SIRI, auto adjust brightness, push messages, notifications, blah blah blah...
    Seeems like deleting and adding the mail account once again helped, as i am experiencing a better battery life today. I had read about this somewhere but weired that this could be a solution to a battery drain issue.
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    for more informations about battery normal life see here.
    I guess it's not a normal issue. so connect to Apple Care or wait for a better answer...
    Message was edited by: S. H. Mahmoudi Mehrizi

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    iPhone: Hardware troubleshooting
    http://support.apple.com/kb/TS2802
    Thanks for using Apple Support Communities.
    Regards,
    -Norm G.

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