How Much Does a Car Battery Cost?

Twenty years ago a car battery was a car battery and the price varied mainly by size. Now the type is decided by the car, and a stop-start car cannot safely take the cheap battery that fitted its predecessor. The three questions that set the price are: what type does your car need (standard, EFB or AGM), what physical size and capacity, and does the car need the new battery registered to its energy management system. A free battery test answers the first question most drivers actually have, which is whether it needs replacing at all.

Norwich Tyres & Auto Service · 2 min read · Reviewed 18 September 2026

Standard, EFB or AGM

• Standard flooded lead-acid: for cars without stop-start. The cheapest type.
• EFB (enhanced flooded battery): for cars with basic stop-start. Built to survive far more discharge cycles. Noticeably dearer than standard.
• AGM (absorbent glass mat): for cars with stop-start plus regenerative braking, or heavy electrical loads. The most expensive type and the one many premium German cars specify.

Fitting a standard battery to a stop-start car is a false economy: it fails early, often within a year, because it was never designed for the cycling. Fitting an EFB where an AGM is specified is the same problem in milder form. We fit the type the car specifies. Our battery types guide goes into the chemistry.

Size, Capacity and Brand

Within a type, price rises with physical size, amp-hour capacity and cold cranking amps. A big diesel needs far more cranking power on a January morning than a small petrol. Brand matters less than type, but the batteries we fit come with a proper warranty and we will tell you what it is. We check the specification against the vehicle rather than against whatever was in there, because previous owners fit the wrong battery more often than you would think.

Fitting and Battery Registration

On many cars built in the last decade the new battery must be registered (coded) to the car's battery management system with diagnostic equipment. Skipping it means the car keeps charging as if the old, tired battery were still fitted, which shortens the life of the new one and can stop the stop-start working. Fitting can also involve keeping the car's memory alive during the swap so radio codes and settings survive. Both are part of the job with us, not extras discovered afterwards.

Battery or Alternator?

A car that will not start on a cold morning does not always need a battery. If the battery light stays on while driving, the headlights dim at idle or a new battery goes flat within weeks, the alternator or the charging system is the fault and a battery would only mask it briefly. We test the battery, the charging voltage and the drain before recommending anything, because replacing a good battery is money wasted and replacing it without finding the drain means doing it again. Our cold-start guide explains the symptoms.

Batteries at Ber Street

Free battery and charging test, the correct type fitted and coded where required, usually the same day, and the old battery recycled. Call 07933 900901 with the registration and we will tell you which type your car takes and quote it. Open seven days including Sunday, which is when most batteries seem to give up; see the battery changes page for the full service.

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