The alternator is over charging the battery
Regulator is not working.most of newer cars is built in in alternator so if it is you need to replace alternator ,.if you wait to long you will damage battery
Then the alternators regulator failed &
you replace it, after a test to confirm the problem
Or you work on what controls the regulator & that
may be any number of things from ignition switch & on
to the cars computer
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