WHEN CHARGING MY NOKIA MOBILE WITH 2 DIFFERENT CHARGERS THE BATTER BACK UP CHANGES

Mr.

New member
WHY !? i am using a nokia mobile and recenty i purchased a china adapter for it when i went out of city for emergency , what i noted wa when i charges in org nokia adapter i get about 28 hrs back up and via china i get only 16 hrs even though the charging time are equal on both the cases , how can by changin the adapter the battery back up varies also recommend me nbest ways of maintaining the battery life
 
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