Car servicing: 7 Tips for better battery health

Your car’s 12-volt battery is one of the most important parts under the bonnet. Without it, your vehicle won’t start, your electrics won’t run, and your day can quickly be thrown off track. The battery powers the starter motor, lights, heating, and  infotainment systems – making it absolutely essential for safe and comfortable driving.

At our independent garage in Southampton, we often see drivers caught out by a weak or flat battery – usually at the most inconvenient time. With the right care, however, you can extend the life of your car battery and reduce the risk of breakdowns. Here are seven practical tips to keep your battery healthy all year round.

1. Avoid Frequent Short Trips

Short, stop-start journeys can prevent your car’s battery from fully recharging. Over time, this can cause the battery to weaken and lose capacity. Where possible, try to drive your car for at least 20 minutes on each trip to allow the alternator to properly recharge the battery. If you mostly use your car for short commutes or errands, consider taking it for an occasional longer drive to give the battery a chance to recover.

2. Keep the Terminals Clean

Corrosion can build up on the battery terminals, restricting the flow of electricity and causing starting issues. As part of your regular car maintenance, check that the terminals are free from corrosion and that the cables are tightly secured. If you do notice any build-up, you can clean it safely with a mixture of baking soda and water, using a brush to gently remove the residue. Applying a small amount of petroleum jelly afterwards can also help prevent further corrosion.

3. Use Electronics Wisely

When the engine is off, your battery is the sole power source for all electrical accessories. Leaving lights, the radio, heaters, or chargers running without the engine can quickly drain the battery. Most drivers have experienced the frustration of returning to a car that won’t start after listening to music or charging a phone with the engine off. To protect your battery, limit electronic use when parked and always double-check that lights are switched off before leaving the car.

4. Protect Your Battery from Extreme Heat

Many people assume winter is the hardest season for a battery, but high summer temperatures can be equally damaging. Excessive heat (30°C and above) accelerates chemical reactions inside the battery, leading to faster deterioration. While you may not notice the issue immediately, the damage often becomes apparent in winter when the battery struggles to start the car. During hot weather, try to park in shaded areas or garages to keep your battery cooler for longer.

5. Invest in a Quality Battery Charger

If you don’t drive your car regularly or plan to leave it unused for several weeks, a smart battery charger is a worthwhile investment. These devices help maintain a steady charge, preventing the battery from going flat and saving you from the hassle of jump-starting your vehicle. Many modern chargers also come with built-in diagnostics, allowing you to monitor the health of your battery over time.

6. Watch Out for Parasitic Drains

Some modern vehicles have electrical systems that continue drawing power even when the engine is switched off. Known as parasitic drains, these small but continuous draws can flatten a battery over time. If you find your battery frequently needs a jump start, it’s worth having a professional technician check the car for hidden drains and resolve them before the issue worsens.

7. Replace Before It Fails

Car batteries don’t last forever. Even with proper maintenance, most need replacing every three to five years. To avoid being stranded, consider proactive car battery replacement rather than waiting until the battery fails completely. At E&J Jarvis, we supply and fit high-quality batteries for all makes and models, ensuring you’re back on the road quickly and safely.

Final Thoughts
Looking after your car battery doesn’t require much effort, but the benefits are significant.  By following these tips, you’ll reduce the risk of being stranded with a flat battery and save money in the long run.

If you’re concerned about the health of your battery or would like professional advice, the team at E&J Jarvis Car Service & Repair Centre are here to help. Call us on 02380 229 297, and we’ll be happy to assist.