Probably the alternator, assuming the battery and all the connections are OK. That light indicates a problem in the charging system, not necessarily limited to the battery. 
New Battery
Just change the batterie in my smart and the batterie light is still on , I've clean the ground connection and still on so what can it be ??
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It may not be the alternator but that would be a good place to start (as well as the drive belt for the alternator.)
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