Mobile battery replacement · Alternator or battery?
Alternator Or Battery? On-Site Testing in Coundon
Not sure if it is the battery or the alternator in Coundon? We test both under load before recommending anything. Mobile battery replacement across CV6.
The two faults feel identical from the driver's seat and cost very different amounts to fix. The distinguishing test takes about ninety seconds with the engine running, which is why nobody should be guessing.
If your battery in Coundon is more than 4 years old and keeps going flat, you're past jumpstart territory — you need a proper replacement, fitted and coded on your driveway.
A properly registered AGM battery in a BMW, Audi or VW will last 6–8 years. A flooded battery dropped in without coding, in the same car, will fail in under 2.
Charging faults found nearby
Recent job nearby: a vehicle in Coundon jumped four times in a week. Charging voltage 12.7V at 2,000rpm with lights on — alternator, not battery, and the owner stopped throwing money at parts.
Recent job nearby: a car near Coventry with an intermittent battery light. Ripple test showed a failed diode; the battery itself tested perfectly.
The readings that separate them
- Belt condition and tension are inspected, since a glazed belt slipping under load mimics a failing alternator.
- Ripple voltage is checked for failed diodes in the rectifier pack, which can charge adequately but destroy a battery over months.
- Memory saver used during change so radio codes, seat memories and ECU adaptations are preserved
- Battery Replacement work here is judged against the vehicle's own specification rather than a generic pass mark.
How the two faults present
Around Coundon this comes up most with higher-mileage vehicles and with cars that have been repeatedly jumped by well-meaning neighbours.
Locally that means the streets between Coundon and Coventry, with access via M6 J2/J3 and M69 and a practical radius reaching Coventry (~2 mi) and Nuneaton (~9 mi).
Alternator vs battery questions
Q.Do you cover Coundon and the CV6 area for this?
Yes. Coundon is inside our routine coverage from Oldbury via M6 J2/J3, roughly 2 miles from Coventry. We cover it alongside Coventry and the surrounding streets.
Q.What do you do with my old battery?
It goes back to a licensed recycler. Around 99% of a lead-acid battery is recyclable. No landfill, and we don't charge for disposal.
Q.Do I really need OBD coding when the new battery goes in?
On post-2012 BMW, Audi, VW, Ford, Vauxhall, Peugeot and Citroen — yes. Without coding, the alternator will overcharge the new battery and kill it in under a year.
Q.The car started on jump leads and then died. What does that mean?
Classic charging fault. The engine ran on borrowed energy and stopped when the battery could no longer supply the ignition system.
Q.Can a bad alternator ruin a new battery?
Yes, in both directions. Undercharging sulphates the plates; overcharging boils off electrolyte. Both shorten life dramatically.
Q.Do you replace alternators too?
We diagnose them on-site and can replace batteries on the spot. Alternator replacement is a workshop job, and we will tell you exactly what needs doing so you are not paying for diagnosis twice.
Who needs this test
Anyone in Coundon who has been told "it's the battery" twice and is not convinced.
Domestically, 1930s semis and modern estates dominate around here, which shapes how these jobs are accessed and worked.
Find out which it actually is
Ninety seconds of testing in Coundon saves buying the wrong part twice. Tell us the vehicle and the symptom and you will get a firm price before anyone sets off.
Local reference data — Coundon
- Local authority
- Coventry City Council
- Page focus
- Alternator or battery?
- Nearest major town
- Coventry (~2 miles)
- County
- West Midlands
- Postcode districts
- CV6
- Service covered here
- Battery Replacement
Areas we test in
Working out from CV6, the practical radius for a battery replacement takes in Coventry, Nuneaton, Bedworth and Rugby — all within a few minutes of M6 J2/J3.
Why this is safe to book
- Diagnosis is given in numbers — resting voltage, charging voltage and ripple — not adjectives.
- Fully insured for work on driveways, business premises and private car parks across Coventry City Council.
Related pages
- Van Jumpstart — alternator or battery? in Coundon
- Fleet & Business Jumpstart — alternator or battery? in Coundon
- Driveway and home callout — battery replacement in Coundon
- Vehicle left standing — battery replacement in Coundon
- New battery supply and fitting — battery replacement in Coundon
- Alternator or battery? in Coventry (~2 mi)
- Alternator or battery? in Nuneaton (~9 mi)
- Alternator or battery? in Bedworth (~5 mi)
- Alternator or battery? across Coventry
- Battery Replacement in Coundon — main page
- All jumpstart services in Coundon
The short version
Storage fault or supply fault — the tests are different, the costs are different, and guessing is expensive. Every visit here includes the charging check. If you would rather plan it than react to it, a battery replacement can be booked for a time that suits.
Stranded with a flat battery?
Call now or send a WhatsApp — we'll confirm your quote and dispatch the nearest engineer.