Car Battery Buying Guide
Last updated: 24 April 2026
Your car battery provides the electrical energy to start the engine and power accessories. Most batteries last 3-5 years. Cold weather, short trips, and parasitic drains accelerate failure. Check CCA (cold cranking amps), physical size, and terminal layout when choosing a replacement.
Choosing the right car battery
Match these specifications to your vehicle's requirements.
- CCA (Cold Cranking Amps) — must meet or exceed the OE specification
- Physical dimensions (length × width × height) must fit the battery tray
- Terminal layout — positive terminal position varies between makes
- Technology: conventional lead-acid, EFB (Enhanced Flooded), or AGM (Absorbent Glass Mat)
- Start-stop vehicles require EFB or AGM batteries — standard lead-acid will fail prematurely
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CCA ratings, battery group sizes, AGM vs EFB — everything you need to choose the right car battery.
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Frequently Asked Questions
How long does a car battery last?
Typically 3-5 years. Batteries in vehicles with start-stop technology or heavy electrical loads may need replacing sooner.
What CCA rating do I need?
Match or exceed the CCA specified in your vehicle handbook. Higher CCA provides better cold-weather starting but doesn't harm the vehicle.
AGM vs EFB battery — what's the difference?
AGM batteries handle deeper discharge cycles and are required for vehicles with regenerative braking. EFB is a mid-range option suitable for basic start-stop systems.
How much does a car battery cost?
The price of a car battery depends on your exact vehicle and the brand you choose. Enter your registration above to see parts confirmed to fit, then compare prices from the brands we stock on this page. Free UK delivery on orders over £99.
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Alternator vs battery — how to diagnose charging faults and choose the right replacement.
Clock Spring (Airbag Spiral Cable) Buying GuideAirbag warning light, horn failure, and cruise control loss — how a faulty clock spring is diagnosed and what to check before replacement.
Headlight Bulbs GuideH1, H4, H7 — find the right bulb type, understand LED upgrades, and learn why you should replace in pairs.
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