Most car batteries fail at 4–5 years old, and almost always on a cold morning when you're trying to leave the house. The good news is that battery replacement is one of the more transparent jobs to price — provided you fit the right type.
Typical UK price
£80 – £250
Including battery, fitting, and coding where required
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The price difference between battery types is significant — and fitting the wrong type to save money will shorten its life dramatically. Match your car's requirement first, then shop around.
For cars without stop-start. Most cars built before 2010 fall here. Fitting is usually free or under £20 at a parts shop.
For cars with basic stop-start. Designed to handle the more frequent charge/discharge cycles of stop-start traffic driving.
For cars with brake-energy recovery and demanding stop-start — common on premium German cars from 2014, plus many newer family cars. Coding is almost always required after fitting.
How to tell which you need: check your handbook, or look at the label on the battery currently in the car — it will say AGM, EFB, or neither. A reputable garage will check the car's electrical system requirements before quoting.
Be wary of "battery dead" diagnoses without a test. Many alternator and starter-motor issues mimic a flat battery. Replacing a healthy battery won't fix an alternator that isn't charging.
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A new car battery typically costs £80–£250 including fitting, depending on the battery type. Standard lead-acid batteries are £80–£120; EFB (Enhanced Flooded Battery) for cars with stop-start is £120–£170; and AGM batteries for more demanding stop-start systems run £160–£250.
Most car batteries last 4–5 years. Modern batteries in cars with stop-start technology can last slightly less because of the greater number of cycles. Heavy short-trip use, very cold winters, and electrical accessories left running all shorten battery life. A battery showing weakness at 3+ years old is normal.
On older cars (pre-2010), yes — many were straightforward DIY jobs. On modern cars it's risky: most need battery 'coding' or 'registration' with diagnostic equipment after fitting so the charging system knows what battery is installed. Skipping this step shortens the new battery's life. A garage with the right diagnostic kit charges £20–£40 for the coding alone.
It depends on whether your car has stop-start. Cars without stop-start: standard lead-acid is fine. Cars with basic stop-start: EFB is the right choice. Cars with energy-recovery and full stop-start (most premium cars from 2014 onwards): AGM. Fitting a cheaper type than your car needs will shorten its life dramatically.
Slow engine cranking (the starter motor sounds sluggish), dashboard warning lights, headlights dimmer at idle than when revving, electronics behaving oddly (stereo resetting, windows slow), or needing a jump-start to get going. Cold mornings often expose a battery that's nearly done.
Halfords offers free fitting if you buy the battery from them and the fitting is straightforward — that can be cheaper than an independent garage for older cars. For newer cars needing coding, an independent specialist with the right diagnostic tools often beats Halfords on total price. Always compare both.
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