Can You Add Water to a Car Battery? How Much!

Published on: October 5, 2022
Written by Chris Dominic / Fact-checked by Nova Scarlett

If your car battery dies, you may be tempted to add water to it in order to get it working again. However, this is not a good idea and can actually damage your battery. Water can cause the battery cells to corrode and lose their ability to hold a charge.

can you add water to a car battery

If you must add water to your car battery, make sure you use distilled water and that you don’t overfill the cells.

  • Park the car on a level surface and turn off the engine;
  • Open the hood and locate the battery;
  • Remove the battery cap and inspect the water level;
  • If it is below the lead plates, add distilled water until it reaches that level;
  • Replace the battery cap and close the hood;

Will Adding Water to a Battery Fix It?

If your car battery is dead, you can revive it or might be tempted to try adding water to it in order to fix it. However, this is not a good idea and can actually do more harm than good. Water can cause the battery cells to short circuit, which can damage the battery and make it unusable.

Additionally, water can corrode the battery terminals, which can lead to further problems. If your battery is dead, you can charge it fully or it’s best to just replace it with a new one. This may cost you a bit of money upfront, but it will save you from dealing with any long-term issues that could arise from adding water to your battery.

How to Fill Distilled Water in Car Battery?

Assuming you have a car with a lead-acid battery, here are the steps to properly fill it with distilled water:

Park your car in a safe and level spotMake sure the engine is off and that there are no sparks or flames anywhere near the battery.
Remove the battery cap(s)You’ll see one or two small caps on top of the battery; these need to be removed in order to access the cells.
Check the water level in each cellIf any of them are low, use a clean funnel to add distilled water until it reaches just below the level of the lead plates inside (the “plates” are what generate electricity). Do not overfill!
FinallyReplace the battery cap(s) securely.

How to Add Water to Battery?

If your car battery is running low on water, you can easily add water to it yourself. Here’s how:

1. Park your car in a safe place and turn off the engine.

2. Remove the battery cover and locate the cells.

3. Using a clean funnel, slowly pour distilled water into each cell until it reaches the level of the lead plates inside. Do not overfill!

4. Replace the battery cover and start your engine. Check that all the lights on your dashboard are working properly. If they’re not, have a qualified mechanic check your electrical system before driving any further.

Adding Water to Battery Deep-Cycle

Adding Water to Battery Deep-Cycle If you have a battery deep-cycle and it is not holding a charge like it used to, you may need to add water. This is a simple process and only takes a few minutes.

Here’s how to do it:

Remove the battery capsYou will see one or two small holes on the top of the battery. These are where you will add the water.
Using distilled waterSlowly fill each hole until the water reaches the bottom of the hole. Do not overfill!
Replace the battery capsAnd make sure they are tight so no water can leak out.
Charge your battery as usual and check to see if it holds a charge better than beforeIf not, you may need to repeat this process or take your battery to a professional for further diagnosis.

Can You Drink Battery Water?

You may have heard that you can drink battery water in a pinch. After all, it’s just distilled water, right?

Battery water is actually a mixture of sulfuric acid and water. That’s why it’s important to never drink battery water, even if you are desperate for hydration. Ingesting even a small amount of battery water can cause vomiting, diarrhea, and abdominal pain.

If you are unlucky enough to drink a lot of it, you could go into shock or experience seizures. So please, for your own safety, stick to regular old H2O.

How to Refill Battery Acid And Water?

Over time, the battery acid and water in your car’s battery will start to evaporate, leaving behind a crust of sulphuric acid. This can lead to your battery losing power and eventually failing. If you notice that your battery isn’t holding its charge as well as it used to, it’s probably time to top up the acid and water levels.

Here’s how:

1. Remove the battery from your car. Make sure you have a safe place to work on it, away from any sparks or heat sources.

2. Carefully remove the caps from the battery cells. You’ll see two types of fluid inside – one is dark and viscous (the acid), while the other is clear (the water).

3. Using a funnel, carefully pour distilled water into each cell until it reaches just below the level of the plates inside (you’ll be able to see them through the glass). Do not overfill!

4. Now add an equal amount of fresh battery acid to each cell. Again, do not overfill!

5. Replace the caps and give everything a good shake so that the fluids mix together properly.

6. Reinstall the battery in your car and start her up!

Add Water to the Battery before Or After Charging!

Adding water to a battery before or after charging is an important part of maintaining the battery. Water helps to keep the battery’s internal parts clean and free of corrosion. It also helps to cool the battery during charging, which prevents overheating and extends the life of the battery.

If you add water to a battery after it has been charged, be sure to check the level of charge in the batteries regularly. Overcharging can lead to excessive corrosion and damage to the batteries.

How to Make Battery Water?

Making your own battery water is a great way to save money and be more environmentally friendly. Plus, it’s really easy to do! All you need is some distilled water and a little bit of baking soda.

Here’s how to make it:

1. Pour distilled water into a clean container.

2. Add baking soda and stir until dissolved.

3. Use a funnel to pour the mixture into your car’s battery cells. Make sure not to overfill them!

4. Close the battery cell caps and give the battery a good charge before using it again.

can you add water to a car battery

People Also Asked

Can You Add Water to a Dead Car Battery?

It’s not advisable to add water to a dead car battery. Water can cause the battery plates to corrode and shorten the life of the battery. If you must add water, use distilled water and only fill the cells to the level indicated on the battery.

How Do You Know When Your Car Battery Needs Water?

Assuming you have a lead-acid battery, which is the most common type, there are a few things to look for to see if it needs water. First, check the level of the electrolyte, which is the acidic solution that surrounds the lead plates in the battery. The level should be at or above the bottom of the lead plates.

If it’s not, then you’ll need to add distilled water until it is. Next, check the state of charge of your battery. You can do this with a voltmeter or hydrometer.

A fully charged battery will read around 12.6 volts with a voltmeter, and 1.265 specific gravity with a hydrometer. If either of these readings is below 12 volts or 1.225 specific gravity, then your battery needs to be recharged before checking the water levels again. Once you’ve verified that your battery is indeed low on water and needs topping off, use only distilled water to avoid damaging your battery further.

Add just enough until the electrolyte level is back up to where it should be – don’t overfill!

What Happens When Battery Water is Low?

If you’ve ever found a battery leak, it’s likely that the white, powdery substance you discovered is potassium hydroxide. This corrosive material is part of the electrolyte solution in alkaline batteries, and it helps to conduct electricity between the anode and cathode. When water reacts with potassium hydroxide, it forms potassium oxide, which is also corrosive.

If too much water is lost from the electrolyte solution, the battery will no longer be able to function properly. When a battery starts to leak, it’s important to clean up the area as soon as possible. Potassium hydroxide can cause skin irritation and eye damage, so it’s best not to come into contact with it.

Inhaling the fumes from a leaking battery can also be harmful. Once you’ve cleaned up any leaks, check the level of electrolyte solution in your batteries regularly to make sure they don’t need topping up.

What Happens If You Put Water on a Car Battery?

If you put water on a car battery, it will eventually leak out and the battery will die.


If your car battery is running low on water, you can add water to it. However, you should only do this if the battery is not sealed. If the battery is sealed, adding water to it could cause damage.

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