Can't I just get a jump start?

You can, and it'll usually get you moving. But it doesn't tell you why the battery went flat, so if there's a charging fault or a drain you'll be doing it again shortly.

How long should a car battery last?

It varies a lot with use and climate — mostly-short-journey London driving is harder on a battery than steady motorway mileage. Rather than guessing from age, it's worth having it tested.

Will a new battery be coded to my car?

Where the vehicle requires it, yes — that's part of doing the job properly on a stop/start car. Tell us the registration when you book so the mechanic arrives with the right unit and the means to code it.

What if the battery tests fine?

Then you're told that rather than sold one. The mechanic moves on to the charging system, the earths and any parasitic drain.

Can you come to a car park or a workplace?

Usually, provided the site permits it and there's safe space to work. Underground car parks are often a problem on height and ventilation grounds.

Flat battery

Flat car battery — testing it properly, not just replacing it

A flat battery is the most common breakdown cause in the UK, and London driving makes it worse: short journeys, cold starts and cars that sit unused for days rarely give a battery the sustained charge it needs.

The important distinction is between a battery that's simply gone flat and a battery that's failed — or a charging system that flattened it. Replacing the battery without testing the rest often means doing it all again a few weeks later.

Rolling Mechanics arranges an independent mobile mechanic to test the battery, the charging system and the starting circuit at your location, and to fit the correct replacement if that's genuinely what's needed.

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Anywhere within the M25 — and if you're a little bit outside it, we'll still make the effort to reach you.

Signs of a battery or charging fault

Slow, laboured cranking when you turn the key
Rapid clicking and no crank at all
Dashboard lights dimming or the car resetting when you try to start
The car starts after a run but is dead the next morning
Stop/start has quietly stopped working
Battery or charging warning light on the dash
The car has been standing unused for several weeks

Why batteries go flat

Common possibilities, and they're not all the battery's fault:

Age — most batteries have a working life measured in a few years, shorter on short-journey use
Short journeys that never let the alternator fully replace what starting consumed
Lights, boot lamps or interior lights left on overnight
A parasitic drain — something continuing to draw current with the car locked and asleep
A failing alternator that isn't charging properly
Corroded terminals or a poor earth strap, which mimic a flat battery convincingly
Cold weather, which reduces available capacity and increases what starting demands

What the mechanic tests before fitting anything

The sensible order is test first, replace second:

Resting voltage plus a load or conductance test on the battery itself
Charging voltage at the terminals with the engine running
Starter motor current draw and the condition of main leads and earths
Terminal corrosion and clamp tightness
Parasitic drain measurement where the car keeps going flat

Fitting the right battery matters

Modern cars aren't a like-for-like swap. Stop/start vehicles need AGM or EFB batteries, and many need the new battery registered or coded to the battery management system so the charging strategy suits it. Fitting the wrong type, or skipping the coding, shortens the life of a brand new battery. Give us the make, model and registration when you get in touch so the correct unit is on the van.

How booking a mechanic works, and what you pay

Rolling Mechanics is a booking and introduction service, not a repair garage. There are two separate payments and you'll know both before anything is confirmed:

Send us the vehicle, registration, symptoms and location — a map pin from your phone is ideal
We speak to an independent mechanic we know personally and confirm their expected price for the described work
You pay Rolling Mechanics a separate booking and introduction fee to secure the mechanic. It is not a deposit and it is not deducted from the mechanic's bill
The mechanic attends and you pay them directly for their labour, diagnostics, parts and repair work

When a mobile visit may not be enough

Alternator and starter motor replacement is sometimes possible on site and sometimes not, depending on where the manufacturer buried it. Hard-to-trace parasitic drains can take hours of methodical testing that suits a workshop better. Hybrid and electric vehicle high-voltage systems need specialist qualification and equipment and are not a roadside job. If the car is in live traffic, get it somewhere safe first.

We'll either get you back on the road, or our experienced mechanics will give you a solution.

Questions we get asked

What we can arrange

Where we cover

Request a mechanic

Call or WhatsApp us with the vehicle, what it's doing and where it is — you can share your location straight from your phone. Prefer to type it out? Use the request form on the homepage and we'll come back to you.

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Rolling Mechanics is a trading name of Symatec Ltd (company number 17217755). We introduce customers to independent mobile mechanics and charge our own separate booking and introduction fee — see our terms & conditions.