Hi Zulfaz,
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With the information supplied, I first suggest removing any new applications, as this is commonly a result of an application that is using to much resource, which results in the battery discharging even whilst on charge.
If you are playing a Game which requires medium to high resources, this will likely happen every time. However if this happens when not using the handset then it is likely an application running in the background.
Try the above first and let us know how you get on.
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