Car Battery Care - Caring for you car battery is important in order to make sure you don't get let down when you most need it at this difficult time.

Avoid unexpected breakdowns and issues when starting your vehicle by checking the health and condition of your car’s battery. Batteries are more susceptible to failure when it’s cold, so a few simple checks can help make sure it’s performing at its best.

In this guide, we offer practical advice on looking after a car battery, and how to tell when yours is ready for a service.

1. Spot the Signs of a Flat or Failing Battery

The tell-tale signs that show when a battery is flat or failing include:

Dim headlights – Are the headlights dim at idle, but then brighten when you rev the engine?

Struggling starter motor – Does the engine struggle to start when you switch on the ignition?

Change in sound at idle – When you first turn the ignition and switch on an electrical component, does the car’s idling sound change?

It’s not always easy to tell when a battery is low or failing, but checking it regularly will help you to avoid problems, especially if you have an older car.

2. Understand What Causes a Low or Flat Battery

Here is a list the factors which can cause car batteries to lose power:

Leaving exterior/interior lights, or other electrical devices, switched on when the ignition is off.

Frequent short trips, which don’t give the battery enough time to reach full charge.

Using too many electronic devices, especially when the ignition is first switched on.

Extreme hot or cold weather can reduce the amount of energy a battery generates.

Old age. Car batteries should be replaced every five years, even if they’ve been well maintained.

Corrosion of the battery terminals.

Loose cables or a defective charging system (e.g. faulty alternator).

Inadequate maintenance. You should check the battery at the same interval as you check the oil – every fortnight.

3. Adopt Good Battery Health Habits

Simple changes to how you use your car can help maintain a healthy battery. For instance, you should always switch electrical components — like air conditioning, seat warmers, heated rear screen — off before you turn off the ignition. This means that when you next use your car, there won’t be an excessive load on the battery.

If possible, keep your car in a garage when it’s cold as low temperatures make it harder for the engine to turn over, putting strain on the battery. And if you don’t use your car often, make sure you ‘exercise’ the battery every now and again by going for a longer drive as this will charge it up again.

Adopting habits like this can make a big difference to the lifespan of your car’s battery and help you avoid the dreaded jump start.

4. Check the Battery Voltage and Electrolyte Level

You can also check the actual voltage and electrolyte levels, which will help you to spot problems and see if it needs replacing. It’s not difficult – to check the voltage just use a simple battery tester. When a battery is fully charged, and all electrical components are off, it should produce an average of 12.5V. Any reading below 12V is considered low, and you should charge the battery by going for a long drive or using a dedicated battery charger.

You can also check the condition of your car’s battery using a hydrometer, like this one. A hydrometer is used to check the mix of sulphuric acid and water in the battery’s electrolyte, which will give you a better idea of how well the battery is able to hold its charge. You won’t be able to use a hydrometer if your car has a low-maintenance battery.

To use a hydrometer, insert it into each battery cell and draw up a small amount of liquid using the pipette. Record the result for each cell, then work out the average. A fully-charged battery should have a reading of 1.265 or higher. If it’s lower, it’s time to replace the battery.

5. Clean the Battery Terminals, Clamps and Cables

Acid and grime build-up on terminals, clamps and cables can result in poor battery performance, so you should clean and maintain the area regularly. Start by removing the hold-down clamp and the clamps from the terminals (negative first). Then, use a mixture of baking soda and distilled water with an old toothbrush to scrub acid and dirt from the terminals, clamps, and cables. This mixture will neutralise acid and make it easy to clean the terminal posts. Dry the area with paper towels, before replacing the clamps, making sure to avoid overtightening the clamps on the terminal posts.

There are plenty of inexpensive tools that can help with cleaning a car battery, including terminal and post cleaners. Tools like this help you to maintain your battery to keep it working as it should, saving you time and money in the long run.



We have been proudly serving local motorists since 1977, so make your next service or MOT appointment by booking online, calling us even just popping in, and make sure that your Vehicle is maintained to the very highest standard by our manufacturer trained experts, you will also benefit from our extensive knowledge, expertise and manufacturer approved status.

You can rely on our premium standard of care, but at a price that’s right, giving you excellent value for money each time you come to see us.

Here's just a few more reasons why

  • All our Customers will experience superior levels of care
  • Grenson Value Services available
  • Grenson Premier Care Package
  • Only Pre Approved work undertaken
  • All completed by our Manufacturer Trained Technicians
  • Progress reports through the day
  • All vehicles will receive a complimentary vehicle health check
  • Personalised Videos on the Health of your car
  • Wash & Vaccum with all Pre Booked work
  • Courtesy Cars Available -  Please Book *

Dealer Facilities

  • Dedicated service customer parking available on site
  • While you wait servicing available - please book
  • Free Wi-Fi connectivity, coffee and reading matter in customer lounge areas

* Subject to terms and conditions

As part of every service or repair we will carry out a complimentary Grenson Vehicle Health Check – This includes a comprehensive visual check including lights, tyres, exhaust and suspension. You can receive a short video link directly from our Technician with the results. Our Customer Advisors will use a simple traffic light system to show any work required immediately or in the future.

Grenson Motor Company Reporting System
Grenson Motor Company Health Check

Book Your MOT
Book Your MOT

Book your MOT online with Grenson Motor Company

Book Now
Book Your Service
Book Your Service

Book your Service Online with Grenson Motor Company

Book Now

Take a look at our great Maintenance and Servicing offers

More Info

Take a look at some of the Accessories we can provide.

More Info

Grenson Motor Company, Middlewich Road, Crewe, CW2 8UY | MG 01270 507 491 | Mitsubishi 01270 507 491 | Suzuki 01270 507 491 | Kia 01270 581 451

Grenson Motor Company Limited is an Appointed Representative of Automotive Compliance Ltd, which is authorised and regulated by the Financial Conduct Authority (FCA No 497010). Automotive Compliance Ltd's permissions as a Principal Firm allows Grenson Motor Company Limited to act as a credit broker, not as a lender, for the introduction to a limited number of finance providers and to act as an agent on behalf of the insurer for insurance mediation distribution only.

© 2020 Grenson Motor Company
Website by Azizi Motors