When should I change my car battery?
The car battery has no specific expiration date. Depending on the use we make in our car, the battery can last from 2-7 years. In each annual service the car battery is measured.
I changed my battery recently and after two weeks, battery was dead.
In this case probably the electrical system is not properly charging the vehicle battery and appropriate measurement is nedeed as well as alternator check.
Car batteries are warranted and if so for how long?
Closed type car batteries that we use have warranty period of one year.
Why change the car battery after the charge indicator (peephole) indicates that the battery is good?
Due to the fact that the charge indicator of the car battery shows only the condition of one of the six elements of the battery.
Source: Opel Service Greece