The battery of my iPhone 5 easily discharges even if not in use. This started 11 months after purchase. The unit passed the Apple Battery Health Test Protocol but the performance showed otherwise. What is the problem and how do I solve it?

The battery of my iPhone 5 easily discharges even when not in use. The unit was tested by Apple and passed the Battery Health Test although the performance showed otherwise. The battery deterioration started 11 months after purchase and is not covered by Apple warranty. What is the problem of the iPhone5 and would appreciate suggestions on how to address this problem. By the way, I have a 2 year old iphone 4S with a battery performance as good as when it was bought two years ago.

Hi there Dan Laven,
You may find the information in the article below helpful.
iPhone and iPod touch: Charging the battery
http://support.apple.com/kb/ht1476
About battery life and the battery
Battery life and number of charge cycles vary by use and settings. Find more information about batteries for iPhone and iPod.
Find information on how long the battery is expected to last between charges.
Rechargeable batteries have a limited number of charge cycles and may eventually need to be replaced.
-Griff W. 

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