5 Best Sump Pump Battery in 2021 | In-depth Review and Buying Guide

A sump pump with the battery backup is a blessing for any home. But remember that, only with the battery backup! It is only possible when you are using the proper backup system that requires the best sump pump battery. A power outage could happen anytime without prior notice. It is better to keep the best alternative.

Finding a battery for your sump pump is not difficult, but when you want the best deal, it could be puzzling. Overwhelming numbers of products could make you confused. It really takes good research to select the right product.

In a hurry? Here is our top pick: Universal Power Group - Best agm battery

best battery for sump pump backup

Sump Pump Battery Buyer Guide

If you know what features are important to pick the best battery for backup sump pump, it could be easier to get the right product. Here are the facts that you need to consider –


The sump pump you use in the basement of your home, right? So, it is mandatory to buy something compact. The benefit is, you don't have to waste some additional space just for the installation. Check the total dimension of the battery before you going to buy it. At the same time, you are going to handle the battery yourself in most cases. Try to pick something that comes in lightweight.

Easy Installation

Installing a battery backup to your sump pump is not rocket science. You could do it yourself with the necessary tools. Especially, if you want to avoid spending additionally for a plumber. But the fact is, some of the batteries may come with a complex installation process. That requires an expert hand and it costs you a lot. It is always better to purchase something that comes with an easy installation process.

Power Capacity

Power capacity and backup capacity depends on batteries. Some batteries may even give up to 12 hours of backup in case of a power outage while some units may run the pump for only 1 hour. Before you get a new unit, check for the power capacity and the backup capacity of the whole system. Check for, how much water you could remove with a single charge to the battery.

Safety Features

When the battery is activated and giving backup to the pump, you need to know this. Now, based on the type of battery you are using, there may have some features to notify you. Mostly there will be an alarm system that makes an audible sound. This is helpful for safety concerns. However, some items may also come with an LED that indicates the battery backup is activated. Advanced products even come with an individual app that could control it. You need to find out which one do you prefer. Also, consider the right type of lead-acid battery to keep it safe.


To be honest, batteries for the sump pump are not cheap. You will have to spend enough on a single unit. So, make sure you are purchasing the most durable one within your budget. check for the materials used in the product. That ensures the battery is durable. Also, check for the warranty on the product.

Best Rated Sump Pump Batteries Comparison  in 2021







Universal Power Group - Best AGM Battery for Sump Pump (Editors Choice)

12 V

1 Year

Wayne WSB1275 - Best Deep Cycle Battery for Sump Pump

12 V

1 Year

Pump Sentry 822 PS- Emergency Power for Sump Pumps

12 V

2 Year

5 Best Sump Pump Battery Reviews

We have find the tested results and the features of more than 20 top-selling batteries for sump pumps. From the result, we have picked the top 5 best battery for sump pump Backup. Here are the details of these products –

1. Universal Power Group - Best AGM Battery for Sump Pump

Universal Power Group - Best AGM Battery for Sump Pump

If your biggest concern is safety, this unit from Universal Power Group would be a great pick for sump pump. It is an AGM battery that gives you relief from the maintenance. You will have to check it occasionally. The solar wind 12-volt battery is rated for 100Ah that ensures longer backup.

Besides some amazing features, this unit is really affordable. It is the safest option that you could install in the basement to have a good backup. Installation is relatively easy that you could do it yourself. It just requires the essential tools. No matter which place you have chosen to install the battery, it will easily fit the place. You can mount directly to the wall or whichever place you wish. Shock and vibration resistance allows it to remain stable.

The total dimension of the battery is 12.17"x 6.61"x 9.16". The compact size allows you to save space in the basement. Moreover, the weight is only 60 pounds that you could handle yourself. This is the best battery backup for existing sump pump at a low price.


  • Requires less time to recharge
  • Compact enough to save space
  • Longer lifespan
  • Shock and vibration proof
  • Affordable price


  • Not 100% maintenance-free
  • No indicator

2. Wayne WSB1275 - Best Deep Cycle Battery for Sump Pump

Wayne WSB1275 - Best Deep Cycle Battery for Sump Pump

For maximum backup and safety, there is no alternative to using an AGM battery. Wayne WSB1275 is the perfect battery for any power backup system for sump pump. It ensures the maximum backup with less maintenance. Unlike some so-called maintenance-free batteries, this one really gives the relief from additional care.

The sealed lead-acid battery operates at 12-volt and 75-amp per hour. With this, it can continuously pump water from the basement for up to 8 hours. The maximum water pumping capacity is 11,000 gallons. It means there is nothing to be worried about if something bad happens, and there is a shortage of power.

This unit is ready to use a backup battery. As it is pre-charged, you can purchase it for emergency conditions. Just install the battery and get the backup from it.

It is comparatively lightweight and comes with handles on sides. You can easily carry it to the installation area. Moreover, the installation process won't take too much time.


  • Compact for convenience
  • Up to 8-hour backup
  • Pre-charged and ready to use
  • AGM battery with protection


  • Little bit pricey

3. Pump Sentry 822 PS- Emergency Power for Sump Pumps

Pump Sentry 822 PS- Emergency Power for Sump Pumps

For emergency power backup, Pump Sentry 822's performance is great. If you are looking for something compact and convenient, you must buy this unit. The battery backup system comes with an aluminum housing for durability. This battery backup system doesn't come with a battery; you need to purchase a 12-volt battery for it.

The backup system features 1200 watts. This ample power gives the maximum backup for your sump pump. When there is a power outage, the system activates the backup. It perfectly transfers the power system between the AC outlet and the battery backup. When the AC power is available, it will use this power source.

It will automatically resume the power system once the AC outlet is on, and the battery gets ready for next. For most of the 1/3 HP sump pumps, this can continuously provide the power.

This product is the most convenient sump pump battery system that is easy to install. Whether you want to install it on the surface or the wall, you can do it without hassle. The lightweight allows you to carry and handle it conveniently.


  • Compact and lightweight
  • Hassle-free installation
  • 0.33 Horsepower
  • Automatic resuming system


  • Doesn't come with a battery
  • It is expensive

4. Wayne ESP25 - Best Battery Backup System

Wayne ESP25 - Best Battery Backup System

It is really difficult to get the right battery for sump pump backup that comes with advanced features. But if you are ready to spend well, you should grab this Wayne ESP25 battery. This is not a typical 12-volt battery. It is super powerful and upgraded for better performance.

It is rated 2700 GPH at 0' which ensures protection to the sump pump. As the product assembled in the USA, you could be worry-free about the quality. It is super easy to install and use with the pump. It provides hours of backup if there is any power outage. The smart charging feature will recharge the battery for optimal performance.

When the backup system is active, it will notify with a sound. Moreover, there is an LED light to give the reading. It is the safest backup system that has a longer life than traditional batteries. The super-powerful system can remove 10,000 gallons of water with a single charge. In extreme conditions, this helps a lot. The suction design with airlock helps to avoid any mess.


  • Lightweight design
  • Comes with the battery box
  • Audible alarm
  • LED light with active signal
  • Longer life guaranteed


  • Not a compact one

5. PumpSpy PS2000 - Best WiFi Sump Pump Battery Backup System

PumpSpy PS2000 - Best WiFi Sump Pump Battery Backup System

It is a complete system of sump pump that keeps your basement safe when it is flooded. If you are a techy guy, going to like this PumpSpy PS2000 unit a lot. The uniqueness of this unit is its wireless connectivity. So, you don't have to monitor the system all the time.

Moreover, it comes with its own cellular antenna. You can use its own app on your phone to monitor everything. The internet monitoring system allows for staying updated for 24 hours. Controlling remotely gives you peace and you stay comfortable.

It works perfectly with any 120-volt primary sump pump. The super-powerful design can lift1625 gallons per hour at up to 15 inches for pumping. Conveniently removes the water from the basement and keeps it dry.

It features an automatic system that detects the surge of power and activates the system. When the AC power is available, it will start charging the battery.

Don't bother about the installation. It is easy and you can do with the user manual.


  • High power capacity
  • Complete package
  • Remote monitoring
  • Own app to monitor
  • Long-lasting performance


  • The app is a little bit buggy
  • It is pricey

What Is Sump Pump Backup Battery?

As you know batteries come in different forms and styles. The question is what is a battery that suitable for your sump pump backup. Batteries that suit a sump pump are known as sump pump backup battery and it comes in 12-volt. I used to be a lead-acid battery and looks like a typical 12-volt one. The wattage would be safe for the pump. When you are in the power outage, it gives the backup so that you can remove access water from your basement.

Types of Lead-Acid Backup Batteries

As mentioned earlier, sump pump batteries mostly are lead-acid batteries. You will notice different types of lead-acid batteries in online stores which are –

Wet Cell Batteries

This is the most common type of rechargeable battery and widely used for the automotive industry. Wet-cell batteries often also known as the flooded type which contains liquid in it. Mostly it comes with a liquid electrolyte such as sulfuric acid. For starting the car, this could give an amazing performance. You can also use it for your sump pump. But the fact is, in the long run, this type may not be the best. Based on the model and brand, this can be in both sealed and unsealed form.

Gel Batteries

Gel battery is an advanced version of a wet-cell battery. Comparing the features to the wet-cell, this one has some similar features. But the main difference is in the type of liquid used in the battery. Instead of direct acid, gel batteries come with a gel that is considered safe and risk-free. Even in some tough situations like heavy heat, it won't cause any issues. The best fact is, gel batteries known as maintenance-free. This means you don't have to look after it repeatedly. Gel batteries are most common in off-road vehicles because of safety. Moreover, it can provide a longer backup.

AGM Batteries

AGM batteries are a good type of lead-acid battery that is common in sump pumps. Because of technical advancement, it is superior to typical 12-volt batteries for the sump pump. Here the term AGM stands for Absorbed Glass Mat. This is a safe type and more hassle-free. Though acid uses in the battery to keep it wet, it won't be completely open. Instead, glass fiber material in the battery absorbs electrolytes and only keeps the battery wet that it requires. AGM batteries have a unique design that allows you to stack cells closer and increase energy capacity. This is helpful for fast charging.

How to Install Battery Backup to Existing Sump Pump?

People often ask if they can add or install a battery for their existing sump pump. Well, you can add a new battery to your existing sump pump if you know the process. You must need some technical knowledge about tools and how the battery connection works for anything. Before you start, make sure that you have the right tools on hand to use in-demand. Here are the tools that you need –

  • Battery
  • Battery case
  • Connector
  • Battery Cable
  • Steps to Follow

Step 1

First of all, you need to mount the unit to the wall. You may want to place somewhere else instead of the wall but won't be safe. This is easy, and you can mount to the wall without wasting any space. Make sure that you are mounting the unit at a safe distance from the AC outlet. You may have got a cord for AC, make sure that length matches with the distance.

However, it shouldn't be more than 4 feet from the pump. To keep the battery safe, we recommend to place it in a battery box. That will prevent unwanted interruption with the power source.

Step 2

In the next step, you need to connect the battery with your sump pump. There are multiple steps to follow to connect it. At first, check the on/off button and ensure it is in the off position. Now connect the red cable of the battery or the positive cable of the battery to the red terminal of the pump.

Now connect the black cable to the negative terminal of the pump and plug your pump into the sentry's Ac outlet. The AC outlet used to be 120-volt. Once all the connections are done securely, turn the switch on.

Step 3

This is the final step and here you will check if the battery backup to the existing sump pump working or not. You will have to test the installation in two steps. In the first step, start cycling the pump while the battery is connected. Now look for the pump if it is operating properly in the normal condition.

If everything is fine, now remove the pump sentry power cord from the AC outlet to check if it is working with the battery backup. Cycle the sump pump again to check if the battery is working in the battery backup mode.

If you have followed the steps properly, the battery backup is now ready to perform with the existing sump pump.


How long will a 12v battery run a sump pump?

It is tough to answer as the performance and the backup will vary according to the product. It also depends on some technical features of the battery. But on average, if you are using an AGM battery that rated for 100AH, it should run a 600-watt sump pump for at least an hour, and this can for more depending on the battery type. This could increase based on battery quality.

How often replace the sump pump battery?

There are no particular rules that you must have to change the battery for sump pump frequently. But if you consider the safety, the ideal replacement time is 10 years. Remember that you may have to change the battery more frequently if it is not performing well.

How to Add Distilled Water to Sump Pump Battery?

There used to be 6 water filler in a typical sump pump battery. You need to fill them individually. At first, remove the cover from the water holders. Now fill each of them with distilled water. Make sure you are using the recommended water according to the user manual. You may also use some specialized bottles to refill water in the battery.

Can I add battery backup to the existing sump pump?

Yes, you can. You can either use a new battery as a backup or replace the whole unit. Follow the process as described above in this article.

Final Verdict

Picking the best battery for sump pump backup won't be a tough job if you have read the article thoroughly. Check the features of a new unit one by one to have a clear concept about the product. You can't just go online and order one. To have the best deal within the individual price range, pick any of the above items. Follow the best sump pump battery buying guide if you are going for something else rather than from this list.

About the Author Juan Williams

Leave a Comment:

AndrewNelson says October 3, 2020

Thank you for the battery reviews. A few days back My basement was flooded due to heavy rain. I was chilling because I have a sump pump installed in my basement. But for some reason, the pump wasn’t working and the alarm did not go off either. I was thinking about installing extras battery for backup power. A flooded basement is no joke.

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