How long does a car battery last?

A typical car battery lasts 3-5 years. EFB (Enhanced Flooded Battery) batteries last 4-6 years, and AGM (Absorbent Glass Mat) batteries can last 5-7 years. Actual life depends on usage patterns, climate, electrical load, and whether the car has start-stop technology.

What shortens battery life?

The main battery killers are: frequent short trips (battery never fully recharges), extreme temperatures (heat accelerates degradation, cold reduces capacity), infrequent use (self-discharge damages cells), excessive electrical load (dashcams, aftermarket electronics), and using a standard battery in a start-stop car.

What type of battery does my car need?

Cars with start-stop require EFB or AGM batteries — never use a standard battery. Check your owner's manual or the existing battery. AGM batteries are required for cars with regenerative braking. Standard flooded batteries are fine for cars without start-stop. Always match or exceed the original specification.

How can I extend my battery life?

Drive regularly for at least 20-30 minutes to fully recharge the battery. If the car sits unused, use a trickle charger or battery conditioner. Keep the battery terminals clean and tight. Avoid leaving lights or electronics on. In winter, park in a garage if possible.

What are signs of a failing battery?

Warning signs include: slow cranking when starting, headlights dimming at idle, battery warning light on dashboard, needing a jump start, swollen battery case, corroded terminals, and the battery being over 4 years old. Most garages can test battery health for free.

CarCalcs

Battery Life Calculator — Car Battery Health Estimate

Estimate your car battery's remaining life based on age, usage patterns, and battery type.

Battery Age

Annual Mileage

Battery Type

Typical Usage

Climate

Start-Stop System?

How We Calculate This

How Battery Life Is Estimated

The calculator starts with the expected lifespan for your battery type and adjusts for:

Battery type: Standard (~4.5 years), EFB (~5.5 years), AGM (~6.5 years)
Usage: Short trips and infrequent use shorten life significantly
Climate: Colder climates reduce battery life
Start-stop: Increases wear on standard batteries
Mileage: Very low mileage reduces charging time

Remaining life = Estimated total life - Current age

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Actual figures may vary based on driving conditions, vehicle specifications, and other factors.