The Right Way to Recondition Your Car Battery

It is the middle of winter, and your car is just barely starting when you turn the ignition. Your battery has been deteriorating for months, but now it is clear that it needs to be replaced before something goes wrong.

The problem is that battery replacement is not a cheap fix. We all know that car batteries are expensive, and we do not want to replace them anytime soon.

Car batteries can indeed have a lifespan of up to 10 years. Since we all know that there are times when our battery starts giving us trouble, and we need to get it reconditioned. So what do we do? 

Whether you need to replace it or not, this article will tell you if it is worth fixing before making the purchase. We will guide you with simple steps and detailed instructions on how to recondition a dead car battery at home.

Reconditioned Car Batteries: Understand The Process

Car battery reconditioning is a process that improves the performance of your car battery. 

There are many benefits to these reconditioned batteries, such as saving you from a battery repair or purchasing a new car battery. If the process is done correctly, there won't be any side effects or safety hazards that may arise.

  • The process will restore, revive and extend your battery life, and you can save money by not purchasing a new one to replace your car battery right away.
  • If you choose to get a replacement for an existing battery, it will cost around $200, but if you choose to recondition batteries, you will save about half of the price of a new battery.
  • By reconditioning dead car batteries, you are helping to improve and protect the environment. You can contribute to a greener way of living by not contributing to pollution.
  • This could be a source of extra income by doing car repair battery reconditioning services to your friends or family members who own cars and who might have flat batteries in their garage. You have not only learned the skills to refurbish battery, but you have also managed to provide reconditioning services to someone who may need them and make a rewarding income.

How to Recondition Dead Batteries at Home

Reconditioning car batteries could be done with these easy step-by-step and detailed guides. But, before beginning the process, make sure that your materials are ready.

You need to wear gear for protection, such as safety glasses, a dust mask, an apron, and latex gloves. There is a chance that you will come into contact with battery acid, which can be extremely harmful if it gets on your skin or in your eyes. Safety always comes first and remember that it is important to follow the reconditioning instructions carefully.

Here are the ways on how to recondition a car battery at home:

  • Create a mixture of baking soda and water. You will need this solution in case of any potential spills or splashes occur.
  • Remove corrosion in the battery terminals. You can do this by using a wire brush dipped in the baking soda and water solution. You can also use sandpaper grit if this is available but be very careful as it may cause more damage or create sparks.
  • After cleaning the corrosion, use a voltmeter to measure the voltage of the battery. Make sure that the jumper cables are securely connected to the jump leads on either side of your battery and is not loose. The voltage reading will tell you if it will proceed or if the battery has to be replaced. Proceed to the following procedure if the reading is between 10V to 12.6V. Booster cables are not needed if the voltage reading is between 12.0V to 14 volts.
  • Remove the old electrolyte from the battery and refill it with a baking soda solution. Gently shake the battery for about a minute and then drain the solution out.
  • You are now ready to replace the old electrolyte with an Epsom salt solution. Mix the Epsom salt with water and then pour it into the battery hole. You can also use a funnel or small syringe if you prefer but make sure that there are no bubbles left at the top of your battery before putting back the caps then move to the next step.
  • Connect the reconditioned battery up with a 12V power supply and slowly charge it at 2 amps. This will usually take around 24-36 hours. After charging your battery, use a voltmeter again to recheck the voltage. The reading should be between 12.42V-12.6V for an excellent condition battery. You can test for battery life using a load tester. If the voltage is still at 9.6 volts after 15 seconds of testing, your reconditioned car battery is not working.

Frequently Asked Questions

Is it safe to recondition dead battery at home?

The process is safe and only takes a few hours. There are no side effects or safety hazards that may arise as long as you follow the instructions correctly. Even beginners can do it with the help of a step-by-step tutorial.

How do I tell if my battery is not defective?

If your voltage reading is between 12.42V-12.60 volts after reconditioning, then your car battery is in perfect condition.

What happens if the battery gets overcharged?

If you overcharge your battery for too long, it will damage the cells and may not be able to maintain a charge, and may shorten the lifespan of the battery.

Can I bring my flat battery to an auto repair shop for reconditioning services?

Yes, but the process will be more expensive than doing it yourself. The advantages are that you do not have to clean your car battery, and there is no need for safety gear.

What are the signs of corrosion in the battery?

Corrosion is an electrolyte leakage that can be noticed as a white crust on the battery terminal. Corrosion is a buildup of minerals on the terminals that can be removed with baking soda, water, or sandpaper.

How to avoid corrosion in the battery?

To avoid corrosion in the battery, you need to clean the terminals regularly.

Can I use bleach to clean a corroded terminal?

No, never use bleach to clean a corroded terminal, as it will create more damage.

Do I recondition the car battery weekly?

The answer to this depends on your battery's condition and how often you are using your car. If you are using your car almost every day, then you should recondition your car battery more frequently.

If Epsom salt is not available, what else can I use?

You can use copper sulfate or aluminum sulfate as an alternative to Epsom salt.


Car battery reconditioning guide is like an easy manual that will save you money and time. With a few simple steps, your car battery can be working just like new again, without leaving your house for expensive replacements or services from the auto shops. We hope you are guided with instructions on reconditioning old batteries at home through this article.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.