An (Extremely) Comprehensive Guide to Repairing Dead Car Batteries

If your car battery is completely dead, there’s nothing you can do to fix it; it has to be replaced. For extremely weak batteries, however, there are ways to temporarily boost power so you can drive to a mechanic for a proper checkup.

Car batteries can be dangerous to work with if you’re inexperienced. If you suspect an issue, we strongly suggest that you bring your car to your nearest Natrad Autocare location for a service and a car battery replacement.

Those are the important answers out of the way. Now, let’s go into detail. Have a quick scroll down and you’ll see this is quite a long article. Don’t worry — we promise that there’s no fluff here. Use this list of contents to jump straight to whatever you want to know.

Understanding Car Battery Issues

Causes of a Dead Car Battery

A car battery can die for a variety of reasons, many of which are preventable. From user mistakes to natural wear and tear, understanding these causes can help you maintain a healthy battery. Here are some common reasons your car battery might fail:

  • User error: Leaving lights on or accessories plugged in can drain the battery. Using the car frequently for short trips without allowing the alternator to recharge the battery can deplete its power.
  • Battery age: Over time, batteries naturally degrade and lose efficiency. The typical lifespan of a car battery is 3-5 years. As it ages, sulphation occurs, which is the buildup of lead sulphate crystals on the battery plates.
  • Defective battery: Manufacturing defects can cause premature failure. If a new battery dies repeatedly, it might have an internal defect.
  • Charging system issues: Problems with the alternator, serpentine belt, or battery cables can prevent the battery from charging properly.
  • Corrosion on battery terminals: Build-up on terminals can hinder electrical flow, leading to starting issues and overall poor battery performance.

Signs of a Dead Car Battery

Recognising the signs of a failing battery early can help you avoid unexpected breakdowns. Here are common symptoms that indicate your car battery may be on its last legs:

  • Car won’t start: The engine doesn't turn over when you turn the key.
  • Battery or check engine light is on: These indicators suggest there’s an issue with the charging system or the battery itself.
  • Electrical problems: Dim lights, malfunctioning electronics, or a slow-cranking engine indicate the battery isn’t providing sufficient power.
  • Unusual smells: A sulphur or rotten egg odour indicates a leaking battery, which is a severe issue that needs immediate attention.

If you notice any of these signs, it’s a good idea to seek professional assistance. Seeing, smelling, or hearing symptoms we haven’t included? Those might be warning signs your car needs a service.

Can a Car Battery Be Repaired?

Can you make a dead car battery work again?

In some cases, you may be able to temporarily revive a dead car battery. However, it’s important to remember that these methods aren’t a permanent fix and may only give you enough power to reach a mechanic. Here are some ways to rejuvenate a weak or dead battery, along with guidance on when it’s best to opt for a replacement:

Battery image

For a Weak Battery

If your car battery is weak but not completely dead, there are several methods you can try to bring it back to life temporarily. Below are some commonly used techniques:

Jumpstart Method

Jumpstarting is a quick and effective way to revive a weak battery temporarily. Here’s a step-by-step guide on how to safely jumpstart your vehicle:

Using a Portable Jump Starter:

  1. Turn off the car: Ensure your vehicle is off before connecting the jump starter.
  2. Connect the clamps: Attach the positive clamp (red) to the positive terminal of the battery. Attach the negative clamp (black) to a grounded metal surface on the car.
  3. Turn on the jump starter: Power on the jump starter and then start your car.
  4. Remove the clamps: Once the car starts, remove the clamps in reverse order and allow the car to run for at least 20 minutes to recharge the battery.

Using Jumper Cables and Another Vehicle:

If you don’t have a portable jump starter, you can use jumper cables and another vehicle to revive your battery. Follow these steps carefully:

  1. Position the cars: Place the two vehicles close enough for the cables to reach, but do not let them touch.
  2. Connect the cables: Attach one end of the red cable to the positive terminal of the dead battery and the other end to the positive terminal of the good battery. Connect one end of the black cable to the negative terminal of the good battery and the other end to an unpainted metal surface on the car with the dead battery.
  3. Start the good car: Let it run for a few minutes, then try starting the car with the dead battery.
  4. Remove the cables: Once the car starts, remove the cables in reverse order and allow the car to run to recharge the battery.

Epsom Salt Solution:

If you have some Epsom salt on hand, you can use it to help extend the life of a weak battery. Here’s how to do it:

  1. Prepare the solution: Dissolve 1 part Epsom salt in 3 parts warm distilled water.
  2. Add to the battery cells: Remove the battery caps and add the solution to each cell until the plates are covered.
  3. Charge the battery: Use a slow charger to charge the battery overnight.

Adding Distilled Water:

In some cases, simply adding distilled water can help restore a weak battery. Here’s what to do:

  1. Check electrolyte levels: Open the battery caps and check the fluid levels.
  2. Top up with distilled water: Add distilled water to any cells that are low, covering the plates.
  3. Charge the battery: Use a trickle charger to slowly recharge the battery.

For a Completely Dead Battery

If jumpstarting or adding solutions doesn’t work, you may need to consider replacing the battery. However, if the issue is related to low electrolyte levels, you can try the Epsom salt solution first. Here’s a detailed guide:

Epsom Salt Solution for Dead Batteries:

This method can sometimes revive a dead battery, although it’s not always a guaranteed fix. Follow these steps to give it a try:

  1. Remove the battery: Disconnect the battery cables and remove the battery from the car.
  2. Prepare the solution: Mix Epsom salt with distilled water as described above.
  3. Fill the cells: Pour the solution into each cell, ensuring the plates are fully submerged.
  4. Shake the battery: Gently shake the battery to mix the solution and distribute it evenly.
  5. Charge the battery: Use a battery charger to charge the battery slowly. This process can take several hours to a day.

Battery Replacement:

If none of these methods work, a replacement may be the best solution. Here’s how to install a new battery:

  1. Remove the old battery: Disconnect the negative cable first, then the positive cable. Remove any securing brackets and lift the battery out.
  2. Clean the terminal connectors: Use a battery terminal cleaner or a mixture of baking soda and water to clean any corrosion.
  3. Install the new battery: Place the new battery in the tray, secure it with the brackets, and connect the positive cable first, then the negative cable.
  4. Test the installation: Start the car to ensure the new battery is working correctly.

Reviving a dead battery can be a temporary fix, but understanding these methods can help you decide when a replacement is necessary. Always prioritise safety and follow proper procedures to prevent accidents. For professional battery checks and replacements, schedule an appointment with Natrad Autocare.

Battery image 2

How to Recondition a Car Battery That Won’t Hold Charge

Reconditioning a battery that won’t hold a charge involves a few detailed steps to help restore its capacity. Here’s a comprehensive guide:

Cleaning the Battery Terminals

Cleaning terminals is essential in reconditioning a battery, as it ensures a proper connection. Follow these steps to clean your battery terminals:

  1. Safety first: Wear gloves and eye protection.
  2. Prepare cleaning solution: Mix baking soda with water.
  3. Disconnect the battery: Remove the negative cable first, then the positive.
  4. Clean the terminals: Use a brush to apply the baking soda solution to the terminals and scrub away any corrosion. Rinse with water and dry thoroughly.

Checking and Refilling Electrolyte Levels

Low electrolyte levels can lead to poor battery performance. Here’s how to check and refill them safely:

  1. Open the battery caps: Carefully remove the caps from each cell.
  2. Check the electrolyte levels: Ensure the plates are covered. If the levels are low, add distilled water to cover the plates fully.
  3. Reinstall the caps: Secure the caps back onto the battery cells.

Charging the Battery

Properly charging the battery is key to restoring its capacity. Here’s how to perform the charging process:

  1. Use a desulphation charger: This type of charger sends pulses to dissolve sulphate crystals on the battery plates.
  2. Connect the charger: Attach the positive lead to the positive terminal and the negative lead to the negative terminal.
  3. Set the charger to desulphate mode: Follow the charger’s instructions to start the desulphation process.
  4. Monitor the process: Desulphation can take several hours to days, depending on the battery condition. Check periodically to ensure the charger is working correctly.

Performing a Load Test

A load test is used to check if the battery holds a charge under stress. Here’s how to conduct it:

  1. Disconnect the charger: Once the charging is complete, disconnect the charger.
  2. Reconnect the battery: Attach the battery cables back, connecting the positive cable first, then the negative.
  3. Conduct a load test: Use a battery load tester to check if the battery holds a charge under load. Follow the tester’s instructions for accurate results.

Maintenance Tips After Reconditioning

Reconditioning can extend battery life, but proper maintenance is still essential. Here are some tips:

  1. Regular checks: Check electrolyte levels and clean terminals regularly.
  2. Avoid deep discharges: Try to keep the battery charged and avoid letting it discharge completely.
  3. Use a trickle charger: When not using the vehicle for extended periods, use a trickle charger to maintain the battery’s charge.

Reconditioning a car battery can extend its life and improve performance, but it’s essential to follow these steps carefully. If the battery still doesn’t hold a charge after reconditioning, it may be time to consider a replacement. For professional assistance and battery services, visit Natrad Autocare.

Let Us Revive or Replace Your Dead Battery

You’re only about halfway through this guide. We hope you’ve found what you’ve read so far useful, but we reckon the most important advice we can give you is this: leave it to the professionals. Car batteries can be dangerous to handle, so bring your car in for a battery replacement today.

How to Bring an Old Car Battery Back to Life

Reviving an old car battery involves several steps to restore its functionality and extend its lifespan. Here’s a detailed guide:

Checking and Refilling Electrolyte Levels

To bring a battery back to life, maintaining proper electrolyte levels is crucial. Here’s what to do:

  1. Safety first: Wear gloves and eye protection.
  2. Open the battery caps: Carefully remove the caps from each cell.
  3. Check the electrolyte levels: Ensure the plates are covered with fluid.
  4. Add distilled water: If the levels are low, top up with distilled water until the plates are fully submerged. Avoid overfilling.

Cleaning and Maintaining Battery Terminals

Regularly cleaning terminals can prevent corrosion and ensure smooth performance. Here’s how:

  1. Prepare cleaning solution: Mix baking soda with water to neutralise any acid.
  2. Disconnect the battery: Remove the negative cable first, then the positive.
  3. Clean the terminals: Use a brush to apply the solution to the terminals and scrub away any corrosion. Rinse with water and dry thoroughly.
  4. Apply a protective coating: After cleaning, apply a thin layer of petroleum jelly or a commercial battery terminal protector to prevent future corrosion.

Charging the Battery

Charging an old battery slowly can help restore its power. Follow these steps:

  1. Use a trickle charger: This charger provides a slow, steady charge, which is gentle on the battery.
  2. Connect the charger: Attach the positive lead to the positive terminal and the negative lead to the negative terminal.
  3. Set the charger: Adjust the settings to deliver a low amp charge (typically two amps or less).
  4. Monitor the charging process: Allow the battery to charge slowly, which can take several hours to a day. Ensure the charger turns off automatically when the battery is fully charged to prevent overcharging.

Performing a Load Test

A load test helps determine if your reconditioned battery can hold a charge under stress. Here’s how to perform it:

  1. Reconnect the battery: After charging, reconnect the battery cables, starting with the positive cable, then the negative.
  2. Conduct a load test: Use a battery load tester to check if the battery holds a charge under load. Follow the tester’s instructions for accurate results.
  3. Assess the battery condition: If the battery passes the load test, it’s likely revived and ready for use. If it fails, it may need further reconditioning or replacement.

Additional Tips for Battery Maintenance

Maintaining your battery properly can extend its lifespan. Here are some additional maintenance tips:

  1. Regular checks: Periodically check the electrolyte levels and clean the terminals.
  2. Avoid deep discharges: Try to keep the battery charged and avoid letting it discharge completely.
  3. Use a trickle charger: When not using the vehicle for extended periods, use a trickle charger to maintain the battery’s charge.

Bringing an old car battery back to life requires careful attention and proper maintenance. These steps can help extend the battery’s life and improve its performance. For professional assistance and battery services, visit Natrad Autocare.

Battery image 3

Battery Acid Safety and Maintenance

Handling Battery Acid Safely

Working with battery acid can be hazardous if not handled correctly. Follow these safety guidelines:

  • Wear protective gear: Use gloves and goggles to protect yourself from the corrosive effects of battery acid.
  • Clean up spills immediately: Use baking soda to neutralise acid spills. Follow up with a thorough rinse with water to ensure all acid is removed.

Maintaining Proper Battery Acid Levels

Proper acid levels are crucial for battery health. Regularly check and top up with distilled water if needed, especially for non-sealed batteries that may lose water over time.

Preventive Care and Maintenance

Regular Use and Charging

Using your vehicle regularly helps keep the battery charged. If your car is inactive for long periods, use a trickle charger to maintain the charge, which helps prevent battery discharge and prolongs its lifespan.

Maintenance Tips

  • Check acid levels and top up with distilled water: Prevents the battery from drying out and maintains its performance.
  • Conduct regular load tests: Ensures the battery is holding charge properly and can deliver the necessary power.
  • Clean battery terminals: Prevents corrosion and ensures good electrical contact.
  • Ensure battery cables are secure: Loose cables can cause charging issues and reduce the battery’s efficiency.
  • Avoid overcharging: Overcharging can damage the battery cells and reduce their lifespan. Use a charger with an automatic shut-off feature to prevent this.

When to Replace Your Car Battery

Signs Indicating It’s Time for a Replacement Battery

Not all battery issues can be fixed with maintenance or reconditioning. Here are signs that it may be time to replace your car battery:

  • Difficulty starting the car: If your car struggles to start, especially in the morning or after sitting for a while, the battery might be failing.
  • Frequent need for a battery booster or jumpstart: Needing to jumpstart your car often is a clear sign that the battery is no longer reliable.
  • Battery age: Typically, batteries last 3-5 years. If your battery is approaching this age, it’s wise to consider a replacement before it fails completely.

Frequently Asked Questions

How to Recondition a Car Battery That Won’t Hold Charge?

Reconditioning involves desulphation using a battery reconditioning charger, which can restore the battery's ability to hold a charge. This process dissolves sulphate crystals that have built up on the battery plates.

How to Bring an Old Car Battery Back to Life?

Reviving an old battery involves checking and refilling electrolyte levels, cleaning terminals, and using a trickle charger to recharge it. Ensure you follow safety precautions when handling the battery.

What to Do with a Frozen Battery?

Thaw the battery safely before attempting to recharge or jumpstart it. Handle with care to avoid damage or injury. Do not attempt to jumpstart a frozen battery, as it can explode.

Dead Battery? Leave It to the Professionals

There’s quite a lot to consider here. The safest, easiest, and most reliable choice is to leave it to a qualified specialist. If you’re having issues with your car or suspect your battery has died, call Natrad Autocare, and we’ll schedule a battery replacement service immediately.

‍