How often should I change my car's battery?

Mine is already 4 years old, is it time to change it?How often should I change my car's battery?
I'd say whenever it stops holding charge (need ';jumps'; constantly).How often should I change my car's battery?
batterys usually last from 3 to 5 years so when it dies replace it
There is no exact time on how long a battery will last. You can check it by using a Carbon Pile Tester.
when it dies or won't hold a charge it's time to replace it.

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