best battery for sump pump backup

Battery Backup for Sump Pump

Sump pumps are essential for protecting your home against flooding, especially in the rainy season. They are an integral part of our homes, and they’re often left to run for days without maintenance or power.

But if you leave it running too long, it can be a disaster for your home – and even cause structural damage. A battery is a perfect way to ensure that your sump pump will be working when you need it most. But which battery is right for you?

That’s why we researched and compiled this list of the 4 best battery backup systems for sump pumps. They’re reliable, affordable, and the batteries last long enough to protect your home.



Buying Guide

Here are the important things to consider while buying batteries for a sump pump:

battery for sump pump backup

Battery Type

Battery types are usually classified into two categories: primary and secondary. Primary batteries are used when the power source is not readily available, and secondary batteries are for when there’s a ready supply of electricity. Both have their advantages and disadvantages, so it’s important to know which type you need for your application before you buy. Primary batteries are normally more expensive than secondary batteries, but they offer greater power capacity and a longer life span. Secondary batteries are usually less expensive than primary batteries, but they don’t last as long or offer as much power capacity.

Charge Time

Battery charge time can vary greatly from one type of battery to another. For example, alkaline batteries generally take about 1-2 hours to fully charge, whereas lithium-ion batteries require just a few minutes.

Power Capacity

If you have a home sump system, you’ll need to buy batteries that are not only powerful but also easy to handle and charge. Power capacity varies from manufacturer to manufacturer. However, it’s important to note that if you buy a battery that is too small, it will last much longer than if you buy a battery that is too large. So choose wisely!

The most popular batteries for this type of application are button cells. They are compact, easy to use and provide a lot of power for such a small space.

Another option is deep cycle batteries. They offer more power than the button cells, but their power supply is larger, so they require more room in your sump system.

Battery Size And Runtime

Battery size and runtime are two important things to consider when choosing a battery pack for your sump pump backup. The smaller the battery, the lighter the weight, and the better the portability.

On the other hand, the longer the runtime, the more power the battery will give. So when selecting the right battery, keep these factors in mind.

If you need to run your sump pump for more than 24 hours at a stretch, then look for batteries with larger capacities and longer run times.

The best batteries for sump pumps are lithium-ion batteries. They have an excellent energy density, which is much higher than that of alkaline batteries. This means they can hold more power per weight or volume.

Input Voltage

A battery’s input voltage is the voltage applied to the battery when charging. When choosing a battery for your sump pump, make sure it has a 12-volt input, so that you can connect it to your car battery. You can also find rechargeable batteries for your sump pump.

It’s also important to check the voltage rating of the battery. In general, if you are using a battery for your sump pump, it should be rated for at least 10 hours of continuous use.

Input Current

The input current is the number of amperes the battery draws from the power source while charging.

Output Voltage

The output voltage is the voltage provided by the battery once fully charged. The output voltage of the battery must be the same as the voltage of your sump pump. The most common output voltage of batteries used in sump pumps is 12 volts and 24 volts.

Output Current

The output current is the number of amperes the battery provides to the load while charging. When choosing a battery for your sump pump, it’s important to consider the current your pump requires. The output current will determine how many batteries you can get in your sump pump system, and also how long the battery will last.

Life Span

When choosing a battery for your sump pump backup, the life span of the battery should be one of the first things you consider. Your sump pump’s life is directly proportional to the battery life, and so choosing the right one will keep you safe in case of power outages.

While most battery manufacturers have warranties, you should choose a battery with a warranty length that is long enough to cover the lifespan of your sump pump.

Another thing to look at when picking a battery is its capacity – the higher the number, the longer it will last. Some batteries can easily last for 10 years, while others may only last for 2 or 3 years. A good rule of thumb is to buy a battery that has a capacity of more than 5Ah since they are cheaper and easier to replace.

Voltage Range

Batteries are often classified into two different voltage ranges: low and high. Low-voltage batteries are typically 12v to 24v, whereas high-voltage batteries are normally greater than 24v. Some batteries have a voltage range that is specific to the model. For example, some batteries are 18v, whereas others are 24v.


When it comes to battery backup, you want a rechargeable one. When it’s time to recharge your sump pump, it’s better to use a rechargeable battery instead of a non-rechargeable one, as rechargeables are lighter and more compact. They are also cheaper and last longer since they have a longer lifespan than non-rechargeable batteries.

While non-rechargeable batteries will last for years, they’re expensive, and if they fail at some point, you’ll have to replace them with a new model. If you’re not sure whether a battery is rechargeable or not, check the manufacturer’s instructions and if the battery is a sealed unit that can be recharged, then it’s rechargeable.

Read what had to say about the Electric Backup Sump Pumps for Houses.


Is a 12V battery good for a sump pump?

A 12V battery is perfectly fine to power a sump pump, but you need to make sure that the battery is of good quality. They should be in good condition and have a long lifespan, or else, it will be very difficult to maintain them. A 12V battery may not be powerful enough to operate the sump pump, so it’s advisable to use a 24V or 48V battery instead to get more power and longevity.

How many hours can a battery store power for a sump pump?

The number of hours a battery can store power for a sump pump depends on the type of battery you use, the size, and the current drain. For example, lithium-ion batteries, which are the best suited for this task, have a storage capacity of around 40 to 60 hours, whereas the capacity of lead-acid batteries is just 5 to 10 hours. In addition, if your sump pump is wired to run continuously, then you would want to use a battery that has a longer cycle life.

Does the battery for a sump pump have to be replaced often?

Do you need a battery backup for your sump pump?

Yes, you will need a battery backup system to protect your sump pump from power cuts. If you don’t have one, you may need to install a surge protector in your electrical box or switchboard to prevent your sump pump from malfunctioning during a power cut.

What is the most efficient battery for sump pump backup?

The most efficient battery for sump pump backup is the 18650 Li-ion cell. It has a longer lifespan and is more durable than the older 18350 cells. It is also less expensive, so you might want to consider this option for your backup battery.

What kind of battery should I use for a sump pump?

The best choice would be the most powerful batteries you can find. It should be able to deliver enough energy to start the sump pump for as long as possible. The smaller the battery, the lower the power and the shorter the life.

What size of battery should I use for my sump pump?

The minimum size of the battery should be 4Ah. If you have a submersible sump pump, then you should make sure that the battery has a rating of at least 10 Ah to prevent corrosion.

How do I choose a sump pump battery backup?

Your sump pump battery backup is one of the most important safety devices that you need to consider. Battery back-ups are best for homes that are built on soft soil, as they are not as strong as the ones with concrete footings.

They also need to be properly placed away from the foundation, so that the wind and water don’t cause any damage. You should also be aware that if your sump pump battery backup fails, it could cause a lot of damage to your home or property, so it’s better to invest in a sump pump battery backup that has multiple backup batteries.

How long do sump pump backup batteries last?

Sump pumps generally run for about 15 to 30 minutes, but the battery life depends on the size and type of battery you’re using. If you have a submersible pump with a lithium battery, it will typically last 2 to 3 years. On the other hand, if you’re using a car battery, it will last about 1 year.

Can you use a UPS battery backup for the sump pump?

No, you cannot use a UPS battery backup for a sump pump. The UPS battery backup is meant to protect your computer system or other electronic equipment from power spikes or brownouts, but this doesn’t have anything to do with your sump pump. Sump pumps are primarily used to prevent flooding in your basement, and they don’t need to be powered by an electric outlet. In fact, they work on batteries just fine.


In the event of a flood or other emergency, your sump pump is one of the most important parts of your home. The more batteries you have, the better chance you have of getting out safely. However, it’s not always the cheapest option.

For a great option at a great price, check out our top pick here on Your Energy Blog. It’s a quality unit that’s been tested and proven to work effectively in real-life conditions.

If you’re looking to save some cash, there are a few options as well. These include the Powerhouse batteries, which are reasonably priced and come with a very good warranty.

And if you’re looking for a budget option, the Powermate batteries are still an excellent choice. They’re highly durable, extremely reliable, and feature a 5-year warranty.

To learn more about the best battery for sump pump backup, check out our homepage here at Your Energy Blog – where we work hard to find you the best energy products for your home.

Leave a Comment

Your email address will not be published. Required fields are marked *