Any battery retail store will check the battery free and tell you if it good or bad. If it is good test the alerrnator and the voltage regulator.
Alternators charge batteries in vehicles. Have you checked the alternator in your eleven year old car? If the alternator is working, the next thing to check is the regulator. Unless you have the special tools and equipment required to check and replace (volt/ohm meter, collection of wrenches) you should probably take your car to the your mechanic.
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Bad battery?
bad alternator?
If you have a voltmeter, measure the battery with the car off. Voltage should be about 12.
Start the car, now measure the voltage, if the alternator is good the voltage should be over 13 volts.
If you don't have a voltmeter, go to Autozone, Checker......for free diagnosis.
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