My iPhone 5 keeps on dying when it says I have around 15% battery left. Anything I can do sort This out?

My iPhone 5 keeps on dying when it says I have around 15% battery left. Anything I can do sort This out?

Check this answer by Lawrence Finch in this post: Re: iPhone 5 battery dies at 5 percent
Lawrence Finch NYC Area
Re: iPhone 5 battery dies at 5 percent 
19.11.2013 01:23 (in response to woo671)
There are two common causes for this issue; either the battery gauge needs recalibration, or the battery is dying. The one you can fix is to recalibrate:
When it shuts off charge for just a minute or two, then restart (hold HOME and SLEEP until an Apple logo appears). Deliberately run the battery down until the phone shuts off at 1%. If it shuts off above 1% repeat the above until you get to 1%. Then charge for 4 hours with the wall charger without using the phone. This process will recalibrate the battery gauge.
To prevent this from happening again about once a month run the battery all the way down to 1%, then continue until the phone shuts off. Apple recommends this in their battery help article, but they don't say why you should do it. The have some hokum about "keeping the electrons moving." Honestly! The iPad battery tip gives the correct reason.

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