Car Battery Testing and Replacement

A reliable battery is essential for keeping your vehicle running and powering its electrical systems. Even if all other components are in top condition, a weak battery can lead to unexpected breakdowns. At Alan Thompson Motor Engineers, we perform comprehensive battery diagnostics to ensure replacements are only carried out when necessary.

Battery Test & Replacement

Before recommending a replacement, our technicians conduct a series of checks:

  • Alternator Charging Check: Verifies the alternator’s output to ensure the battery is being charged properly.

  • Battery Drop-Health Test: Assesses the battery’s internal condition under load.

  • Cold Crank Amp (CCA) Test: Measures the battery’s ability to start the engine in cold conditions.

These diagnostics help identify issues with the battery itself or potential drains in the vehicle’s electrical circuit, preventing unnecessary replacements and saving you money.

Why Regular Battery Checks Matter

Car batteries typically last 3–5 years, but modern vehicles with multiple electronic accessories (phone chargers, infotainment systems, stop-start technology) can strain the battery more quickly. Regular checks—especially before autumn and winter—ensure your battery can handle cold starts and demanding electrical loads.

If a Replacement Is Needed

We offer a wide range of batteries in various sizes and types, sourced from leading manufacturers. Most battery orders are available for next-day fitting, so you get back on the road without delay.

Warning Signs of Battery Trouble

  • Slow Starting : If the engine cranks slowly, your battery may be losing charge.

  • Dim Lights & Electrical Issues: Weak battery power can cause dashboard lights, headlights, and electronics to dim or malfunction.

  • Check Engine Light: A low battery can trigger warning lights; have the battery and electrical system tested promptly.

  • Foul Odours: A leaking or damaged battery may emit a rotten egg smell—stop and have it inspected immediately.

  • Corroded Terminals: White, ashy deposits indicate corrosion, which can reduce electrical contact and performance.

  • Swollen Battery Case: Exposure to extreme heat or cold can deform the battery casing, signaling a need for replacement.

  • Battery Age: If your battery is over three years old, schedule regular performance tests to avoid unexpected failure.

Need Assistance?

Call us on 0161 485 6835 to book your battery check or replacement. Our expert team at Alan Thompson Motor Engineers will ensure your battery and charging system keep you powered up and safe on the road.