Can Reverse Osmosis Water be used in Batteries

Batteries such as lead-acid batteries require water in order to function as the electrolytes need something to hold onto to create electricity.

In order for a battery to function properly, you need to get the best type of water that doesn’t contain any kind of impurities in order to avoid any damage from happening. 

A good option for your batteries is to use reverse osmosis water as reverse osmosis is known to be one of the best filtrations systems for water.

You’ll be able to get the purest form of water that doesn’t contain any minerals that can damage the performance of your car battery.

Here we’re going to show you about reverse osmosis water and a quick step-by-step guide on refilling the water in your batteries. 

Tips When Adding Water on Batteries

1. Safety

Make sure you’re wearing the necessary personal safety equipment like gloves and eyewear to avoid getting injured from handling any dangerous chemicals. Also, make sure to check your battery if it’s able to undergo maintenance.

There are different kinds of car batteries with specific instructions that might say “Do not open” or “Keep vent caps tight after watering service”. 

It’s important that you should follow these warning label instructions in order to avoid damaging your batteries. There are even instances where you can get injured from mishandling delicate chemicals that contain inside the battery.

2. Avoid Adding Too Much Water

As said before, it’s important to avoid placing too much water int the battery as it might actually damage the batteries. Once the batteries start charging, the amount of electrolyte solution will start to increase which causes the water level to rise. 

Also, adding too much water in a battery can also dilute the amount of electrolyte which can reduce the performance of the battery.

3. When to Add Water

The frequency of when you should add water in your battery will depend on how often you’re using it. Car batteries that are only used once during weekends can be replaced once a month while other batteries that are used almost every day might need to its water replaced every week.

It’s best to check the amount of water in your battery regularly to ensure that you can replace it before it starts to get damaged from having less water.

Is Using RO Water Good for Batteries?

The great thing about reverse osmosis water is that it’s able to remove a great amount of impurities that are contained in water.

This makes you have a much cleaner battery system, letting you have one with better functionality that’s able to last longer without affecting its performance.

Longevity is important for batteries as it means that it’s less costly and you won’t have to replace your battery frequently. Reverse osmosis is also able to remove more impurities compared to other filtration systems.

These particulates include minerals that can heavily affect your battery’s performance and even damage it though, this will depend on the type of water source that’s being filtered.

It’s best to use reverse osmosis water on a battery when the water used is clean and free from as many impurities as possible. It’s also recommended to use this type of water compared to distilled water as it is less costly in both electricity and maintenance.

Steps to Replacing the Water in Batteries

Step 1


Turn the engine off and let it cool for a while until there’s not much heat left in it. Open the hood of the car afterward and locate the car battery.

Step 2


Remove the vents of the car battery. Clean the surface before opening the caps to prevent any dust or dirt to enter the inside of the battery.

Step 3

Check the water level of your battery and prepare the water you’re going to use to fill your car battery with. Make sure that the water you’re using for your car battery isn’t contaminated to avoid battery damage.

Step 4


Add the right amount of water that’s just below the cell inspection hole. Avoid putting too much water in your car battery as it can cause the water and acid to leak. 

Step 5

Use fresh water to flush any water or acid that has spilled from the battery.

Step 6

Clean the battery using a cloth so you can dry it up and place vent caps back on so it’s ready to use.

Is RO Water better than Distilled Water?

Using reverse osmosis on for a car battery is another, or even better alternative for refilling the water in your car battery. Distillation water systems aren’t made to completely remove the chemicals in the water. Such chemicals include herbicides and pesticides which have a lower burning point and can cause damage in the car battery.

Compared to RO Systems, distilled water systems cost more to maintain as it needs electricity to operate. This type of operation also requires more water and the condensing gasket also needs to be replaced annually in order to properly function. The total cost of maintenance for all these tools are very expensive.

Reverse osmosis systems don’t really need any electricity to function and you can easily purify normal drinking water making it usable for the car battery. You on[ly have to annually replace the filter which costs less compared to distilled water.


It’s important to use the purest type of water whenever you’re planning to refill water in your batteries. What’s best about using reverse osmosis water is that you’ll be having the cleanest water that doesn’t contain any minerals that can damage your equipment.

Although the concentration and purity will depend on each reverse osmosis water, this will still improve the performance of your car battery. 

You’ll also be able to spend less on maintenance and it doesn’t require that much energy to function. This makes reverse osmosis water a better alternative compared to other types of water systems for batteries.

Jomar Teves

A blogger by day, a tech enthusiast by night, and a downhill mountain biker at the weekends. After four years in business school and working for multinational clients, Jomar believes he can improve the world through his writings. Jomar has six years experience as a writer and is a graduate of the BSBA Entrepreneurial Marketing program. His work has been published on Clutch Points, Blokt and iTech.