How to Add Water to a Sump Pump Battery in 7 Easy Steps

Sump pump batteries are very crucial in homes that experience regular flooding. Without a sump pump, water would continuously enter your home, causing severe damage to your property. A sump pump battery ensures that your sump pump will continue to function despite a power outage.

The batteries are typically sealed lead-acid (SLA) and require little maintenance. However, the electrolyte level in the battery will drop over time and will need to be replenished.

A sump pump battery will eventually run low on water. This is because the liquid inside a wet cell battery evaporates over time, which reduces its capacity. If your sump pump battery loses too much water, it can fail to operate properly.

Fortunately, adding water to a sump pump battery is a quick and easy process that anyone can do with just some basic household items.


Add Water to a Sump Pump Battery Following these 7 Easy Steps

Adding water to a sump pump battery is a simple process that can be done with just a few tools. You will need distilled water, safety glasses, a clean funnel, and gloves. The gloves are optional but recommended as battery acid can be harmful if it comes into contact with your skin.

Step 1: Take Safety Precautions.

Before you begin, put on your safety glasses and gloves as a precaution against battery acid. You should also check the label on your battery to determine the correct amount of distilled water required.

Step 2: Clea the Top of the Battery.

Use a clean cloth to wipe any dirt or debris from the top of the battery. This will help to prevent contamination of the battery when you add water.

Step 3: Remove Battery Caps.

Carry your sump pump outside, so it is not in an enclosed space. Place the open end of a funnel into the vent at the top of the battery, then remove its caps. Depending on the type of cap, you may need a screwdriver or pliers to wiggle it free. Be sure to keep track of which cap went where for reassembly later.

Step 4: Add Distilled Water Slowly.

Slowly add distilled water until you reach the recommended level for your particular battery. You can check the level by looking at the indicator on the side of the battery or by removing the cap and looking inside. Do not overfill the battery as this can lead to problems.

Step 5: Reattach Battery Caps.

Once enough water is added, replace the battery caps and tighten them securely in place. People often forget to do this, but it is essential to keep the battery sealed properly.

Step 6: Wipe Up Any Spills.

If you spill any battery acid, wipe it up immediately with a clean cloth. Then, dispose of the cloth in a sealed container so that it does not come into contact with anyone or anything else.

Step 7: Charge the Sump Pump Battery.

After adding water to your sump pump battery, it will need to be recharged. This can be done by plugging it into a standard outlet or using a solar charger. Allow the battery to charge for at least 24 hours before using it again.

You can easily add water to your sump pump battery and keep it operating correctly by following these simple steps. However, be sure to exercise caution when working with battery acid, and always consult your owner’s manual for specific instructions on your sump pump model.

Frequently Asked Questions

When should I replace my sump pump battery?

You should replace your sump pump battery every 3-5 years. Batteries will eventually wear out and will need to be replaced.

How often do I need to add water to my sump pump battery?

The frequency with which you need to add water to your sump pump battery will depend on the type of battery and how often it is used. Typically, you will need to add water every few months to keep the battery topped off.

What happens if I don’t add water to my sump pump battery?

If you don’t add water to your sump pump battery, it can eventually run dry and fail. This can cause damage to the battery and the pump itself, so it’s best to stay on top of maintenance and add water as needed.

How can I tell if my sump pump battery is low on water?

There are a few different ways to check the water level in your sump pump battery. One option is to look at the label or owner’s manual that came with the battery for instructions. You can also look inside the battery cap to see how high up on the tank walls the fluid has reached. If your fluid levels appear low, you should add more distilled water.

What does it mean when the sump pump beeps?

A beeping sump pump can mean several different things, depending on the model. For example, some pumps will only sound an alarm when low water levels are detected, while others may beep in response to many conditions. To troubleshoot the issue, you should consult your owner’s manual or contact the manufacturer directly.

Should I add battery acid to my sump pump battery?

No, it is not recommended that you add battery acid to your sump pump battery. Battery acid can be dangerous and corrosive, so it is safer to use distilled water instead. If your battery has run dry, you should have it replaced by a professional as soon as possible.

What is battery-specific gravity?

Battery-specific gravity measures the density of a liquid compared to water. It is typically used to measure the charge level of lead-acid batteries, like those used in sump pumps. You can check the specific gravity of your battery with a hydrometer or by looking at the indicator on the side of the battery.

Final Words

Adding water to your sump pump battery is a simple and necessary part of maintenance. By following these steps, you can keep your battery topped off and ensure that it will be ready to go when you need it.

We hope this information has been helpful in learning how to add water to your sump pump battery. If you have any further questions, speak with a professional technician for assistance. Good luck!



Bill is a DIY plumber, handyman, and homeowner with more than a decade of experience. He has replaced and repaired sump pumps, backup pumps, float switches, check valves, and many other things around his family home. An engineer and tinkerer at heart, he is always looking to see how things work and taking on new home projects that help him grow his skillsets. He is a husband and father of two boys, has a bachelors degree in Computer Engineer and minor in Mathematics and likes to make homebrew beer in his free time.

      Sump Pump Advisor