An app provides the notification for battery fully charged. Been long I left development and thus done remember the name of the file. However you can look for the FLASH sign on the battery bar. When the battery is charging there must be a Flash Sign or some similar indication. Once the battery is fully charged, it'll go away. Further even if there is no indicarion it is highly advisable you charge your device for a straight 3 hours and it should be enough, after all thats what we all do...
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