The is no specific answer to what time to replace car battery. However, based on time, there have been generalized facts on what is the best time to replace car battery.
In consideration, the life span of a car battery varies on time heat and vibration
Time
Car batteries age over time. Even in ideal conditions, car batteries conditions fade over time, and they have no longer enough power to start the engine.
Heat
Heat facilitates an increase rate of chemical reaction in batteries. It increases the rate of battery degradation. In cooler climates, batteries last longer as compared to batteries in hotter climates.
Vibration.
Vibration too causes physical breakdown of internal battery parts. To minimize this effect special hold down hardware secure batteries in place and prevents them from moving about. Missing or loose holds downs can significantly shorten battery life.
Persistent over charging of vehicles increases the rate at which the batteries age. Allowing the car battery to go dead completely reduces the lifespan of the car battery.
Weak battery warning signs
The starter motor cranks the engine slowly.
Dim incandescent headlights.
Clicking sounds to the ignition.
A failing battery has a problem it will not be fully able to power your vehicles electrical components during ignition. Always ensure that you have your battery inspected at every oil change to make sure cable connections are clean and tight. Car batteries should be tested at least twice a year not only when they have started showing signs of failing.
Battery selection tips
Your type of car, physical size, terminal configuration and the cold cranking amps and reserve capacity are important factors when making a consideration for a car engine. Fitting the wrong car engine can greatly cause damage to the electrical system of your car and damage.
The cold cranking amps is the measure of your battery’s starting power and should always match the standard requirement.
Reserve capacity measures the time length the battery’s reserve power can hold at a given load.