How much is a car battery? £70 to £130 fitted (2026)

A flat or failing battery is the single most common reason a car will not start, and it always seems to happen on the coldest morning of the year. The good news is that a replacement is one of the cheaper jobs on a car. The catch is that quotes for the same car can be £70 apart, and most of that gap is not mark-up. It is two garages pricing two different batteries.

This guide gives the typical UK prices, then does the thing most battery price pages skip: it shows you how to work out which of the three battery types your car actually takes, so you can compare quotes that are genuinely for the same job.

How much does a new car battery cost?

For a small or mid-sized car with an ordinary battery, expect around £70 to £130 fitted. If your car has a stop-start system, which switches the engine off at junctions, it needs a more advanced battery designed for constant charging and discharging, and the price steps up.

Treat these as market ranges rather than a price list. Two things push a quote to the top of its range: a physically larger battery, and a premium brand with a longer warranty.

Work out which battery your car takes first

This is the step that saves the money, and it takes two minutes. If you ring three garages without knowing your battery type, one will quote you for a standard battery, one for an EFB and one for an AGM, and the cheapest quote will look like the best deal when it is simply the wrong part.

Three quick checks

Does the engine switch itself off at traffic lights? If yes, your car has stop-start and needs an EFB or AGM battery, never a standard one. Look at the label on the old battery. It will usually say EFB or AGM on it, along with the capacity in Ah and the cold cranking amps. Check the handbook. It gives the battery specification the manufacturer intends, and that always beats a rule of thumb.

Then give every garage the same three facts: your registration, the battery type, and whether you want the price fitted. Now the quotes are comparable. Our guide on questions to ask a garage before booking covers the same trick for bigger jobs.

Why the price varies so much

Three things move the price: the size of the battery your car needs, the type of technology, and the brand. Bigger engines and cars with more electrical equipment need higher capacity batteries. Stop-start cars must have an EFB or AGM battery rather than a standard one. And, as with tyres, there is a spread from budget to premium brands, with the dearer ones generally lasting longer and holding a better warranty.

Warranty length is the most useful proxy for quality on a battery, because it is the one number the manufacturer has to stand behind. A battery with a five year guarantee at £140 is usually better value than one with a two year guarantee at £95, since the cheaper one may need replacing twice in the same period. The same logic applies to new tyres and to brake parts.

Where you buy changes the price

The same battery can carry very different fitted prices depending on who supplies it.

An independent garage is usually the best balance, because it can source the correct battery, fit it and register it in one visit. A main dealer will fit the exact manufacturer part and will certainly have the software to register it, but you pay dealer labour rates for a job that takes minutes. Our comparison of a main dealer against an independent garage sets out when the dealer premium is worth paying.

A fast-fit chain often quotes an attractive supply-and-fit price, which is genuinely good value on an older car with a standard battery. On a newer car that needs registration, check the price includes it before you commit. Buying online and fitting it yourself is the cheapest route on paper, but only on a car that does not need registration, and only if you are comfortable that the terminals are the right way round for your cables. A mobile fitter costs a little more and is the obvious answer when the car will not move at all, which is also where a mobile mechanic against a garage is worth a read.

Battery registration, the step that decides how long it lasts

Swapping a battery is quick on many cars, but there is a catch on newer ones. Cars with stop-start and smart charging usually need the new battery registered to the car electronics with a diagnostic tool, so the battery management system knows a fresh battery is fitted.

If the step is skipped, the system carries on charging as though the old, worn battery were still in place. Midtronics, which makes battery diagnostic equipment, explains that the result is either overcharging or persistent undercharging, and that this can cut a battery's working life dramatically. Stop-start can also simply stop working, which is the usual first symptom drivers notice.

Registration is common on many BMW, MINI, Audi, Volkswagen, Skoda, SEAT, Jaguar and Land Rover models, and on most cars with stop-start or an intelligent battery sensor. It needs a scan tool that supports your car, so it is the main reason professional fitting is worth it on a modern car. If the quote is suspiciously cheap for a stop-start car, ask directly whether registration is included. Signs a garage is overcharging you works in both directions: a quote that is too low often means something has been left out.

Why the cheapest battery is a false economy

It is tempting to fit the cheapest battery that fits, but on a modern car that often backfires. A budget battery in the wrong specification, particularly a standard type in a stop-start car, works far harder than it was built for and can be worn out within a year or two. A correctly specified battery from a reputable brand costs a little more but usually lasts far longer and comes with a longer warranty, which works out cheaper over its life.

There is a second cost that never appears on the quote. A battery that dies in a car park costs you a call-out, a wasted morning and sometimes a tow, none of which the £40 you saved will cover.

How long should a car battery last?

The RAC says car batteries generally last between 3 and 5 years. Where yours falls in that range is mostly down to how the car is used.

The RAC notes that frequent short trips and stop-and-go driving put more strain on the battery, because the alternator may not have enough time to fully recharge it between starts. It also points out that lower temperatures significantly reduce a battery's capacity to deliver power, which is why a battery that coped all summer gives up in January. Short journeys are hard on more than the battery: they are also what clogs a diesel particulate filter, as our guide to DPF cleaning costs explains.

Practical upshot: if your battery is four or more years old and the car has started to turn over slowly, budget for a replacement before winter rather than after it. Adding a battery check to your winter car checks and your pre-long-drive checks costs nothing.

Is it the battery, or the alternator?

This is the question worth answering before you spend anything, because the symptoms overlap almost completely and the bills do not.

The RAC lists dimming lights, slow starting, a battery warning light and malfunctioning electrics as signs of a weak battery. A failing alternator produces much the same picture, because the battery is being drained rather than topped up as you drive. The tell is what happens after a jump start: a car with a tired battery but a healthy alternator will usually keep running and recharge, while a car with a failing alternator will die again shortly after the leads come off.

A garage can test the battery and the charging system in minutes, and that test is what stops you buying a battery to fix an alternator fault. An alternator replacement costs considerably more than a battery, and a starter motor replacement is a third possibility when the engine will not turn over at all. Our guides on car battery warning signs, why a car will not start and how to jump start a car safely help you narrow it down before you ring anyone, and dashboard warning lights explains what the battery symbol actually means. If the engine management light is on as well, that guide and a diagnostic check are the next step.

Can a car battery fail an MOT?

Yes, but not for being weak, which surprises most drivers. A battery that struggles to start the car is not an MOT defect at all. How it is mounted is.

The MOT inspection manual covers batteries at section 4.13. A battery that is insecure and likely to fall from its carrier or cause a short circuit is a major defect, which means a fail. A leaking battery is also a major defect. A battery that is insecure but not likely to fall from its carrier is a minor defect, which is recorded but still lets the car pass.

The practical version: if a previous battery change left the clamp loose or the hold-down bracket missing, that is a fail waiting to happen for the sake of a two minute job. It is worth checking as part of preparing for your MOT. See also what is checked in an MOT test, what an MOT advisory means and why cars fail their MOT.

What about electric and hybrid cars?

Electric and hybrid cars still have a conventional 12 volt battery, and it still fails in the same way and at roughly the same price. It runs the lights, the locks, the screens and the systems that wake the car up, so a flat 12 volt battery will immobilise an EV with a full traction battery. It is a common and easily misdiagnosed fault.

The large traction battery is an entirely different component with an entirely different price, and it is covered in how long electric car batteries last. What an EV needs at a garage is set out in electric car servicing, and whether electric cars need an MOT answers the other common question.

How to keep the cost sensible

Five things do almost all the work.

Know your battery type before you ring. Standard, EFB or AGM, as above. Ask for the fitted price. Supply-only quotes are not comparable with fitted ones. On a stop-start car, ask whether registration is included. If the answer is vague, that is your answer. Compare the warranty, not just the price. Five years against two changes the real cost per year. Ask them to test the charging system while it is in. Most garages will do it as part of the job, and it is what stops you back in a fortnight with a flat battery and a worn alternator.

One more: if the car is close to a service anyway, having the battery done at the same time saves a second visit. What is included in a full service shows what is already on the list, how often you should service your car covers the timing, and booking an MOT and service together is the same idea for the MOT.

Booking a battery replacement

A battery is a quick job, so most garages can fit you in the same week and often the same day. Put your postcode in and compare local garages, check their ratings and opening hours and send a booking request in about a minute. Give them your registration, say whether the car is starting slowly or is already flat, and ask for the fitted price including registration if your car has stop-start. You pay the garage directly, and there is no booking fee.

If you want to sanity check the replies first, how to choose a good garage is a short read, and car service costs in Birmingham gives you a feel for local labour rates. If the MOT is due at the same time, what an MOT should cost and checking when your MOT is due are the two things worth knowing before you book.

The bottom line

Budget £70 to £130 for a standard fitted battery, and £120 to £250 for the EFB or AGM battery a stop-start car needs. The number that matters is not the cheapest quote, it is whether the quote is for the right battery type, fitted, and registered to your car. Get that right and a battery lasts the 3 to 5 years the RAC describes. Get it wrong and you buy another one next winter.