Hi, guys, I am currently using ip4 , iOS5.1 The problem i am having now is when my phone is fully charged, it just can't last long. I left my phone idle and without using it, it will automatically turned off. When i turned it on, the battery shown a value( example: 16 %), after a while, it...

Hi, I am currently using iphone4. The problem i am having now is when my phone is fully charged, it just can't last long. I left my phone idle and without using it, it will automatically turned off. When i turned it on again, the battery shown is still with a value such as 95 % and etc (it's...