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Only charge phone with the Sony USB cable, and it should charge to 100 percent. If your phone is running a lot of apps, it might have a hard time staying at 100 percent. If I am running 20 apps at once, (use a Task Manager and see how many apps are really running....or use running applications)

Charges better when plugged into a wall outlet compared to a PC or laptop.

About Phone->Status->Battery Level
 
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