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hello, thanks for posting
It sounds the alternator may not be charging enough, have you had the alternator/charging system checked yet?
Do you have a volt/ohm meter or digital multimeter so we can do a quick voltage check?
What year and model is it and how many miles on the odometer?
I have to go offline for about an hour, if you have a voltmeter connect it to the car battery, start the engine and turn the headlights on, you should read about 13.8 volts, if you do not have a voltmeter please go to an autoparts store (Autozone, O Reilly) and they will be happy to test the charging system for you at no charge, let me know the results, I'll check back with you later.