Deep Cycle Battery for Sump Pump

Best Deep Cycle Battery for Sump Pump: Top 5 Picks in 2024

Last Updated on May 17, 2023

A sump pump backup battery is essential when safeguarding your basement from flooding. But with so many types of batteries available, navigating the landscape and finding one that suits all your needs can seem overwhelming. So how do you find the right battery for your sump pump?

The best deep cycle battery needs to have the right capacity, be compatible with your sump pump and offer advanced features like lightweight durability and maintenance-free use. And, of course, it needs to be reasonably priced too.

So without further ado, let’s look at our top pick of deep cycle batteries for sump pumps and review the features that make them stand out from the crowd. We’ve also included a buying guide that explains how to select the most suitable sump pump battery.

WEIZE 12V Deep Cycle Battery for Sump Pump

High-quality 12V 100Ah deep cycle AGM battery

Battery Cell: Lead Acid
Amperage: 100Ah
Terminal: M8 Bolts
Battery Weight: 60 Pounds
Dimensions (LxWxH): 12.99 x 6.73 x 8.34 Inches

PumpSpy Best 75Ah AGM Deep Cycle Battery for Sump Pump

Vibration-resistant AGM 75Ah battery for continuous use

Battery Cell: Lead-Acid, AGM
Amperage: 75Ah
Terminal: M6 Bolts
Battery Weight: 50 Pounds
Dimensions (LxWxH): 10.25 x 6.75 x 8.25 Inches

BASEMENT WATCHDOG Deep Cycle Lead Acid Battery for Sump Pump

Maintenance-free design for easy installation and operation

Battery Cell: Lead Acid
Amperage: 25Ah
Terminal: HPT
Battery Weight: 20 Pounds
Dimensions (LxWxH): 11.75 x 7 x 10.5 Inches

Table of Contents

Here Are Reviews of the Best Deep Cycle Battery for Sump Pump

As sump pumps are a vital part of keeping our homes free from flooding, it’s essential to have the best battery backup for sump pumps. With the right battery, you’ll be able to ensure your sump pump works properly and efficiently every time.

Here are reviews of some of the leading deep cycle batteries today, from top-of-the-line powerhouses boasting long life cycles and quick charging capabilities to more affordable but still reliable models.

1. WEIZE 12V Deep Cycle Battery for Sump Pump

WEIZE 12V Deep Cycle Battery for Sump Pump

For reliable power backup for a sump pump, the WEIZE 12V battery is the best choice. This lead-acid battery boasting 100Ah of amperage and an advanced spill-proof design provides effortless convenience as it requires no maintenance. This makes it suitable for commercial and personal use.

High Amperage and Spill-Proof Design

The WEIZE 12v deep cycle battery for sump pumps offers an impressive amperage of 100Ah, allowing you to power even the most demanding applications. And its spill-proof design makes it highly safe to use. There is no maintenance or refilling necessary.

This innovative feature makes it ideal for both commercial and personal use, giving you peace of mind when powering your equipment.

Compact Size and Lightweight Construction

Despite its impressive 100Ah amperage capacity, this battery is incredibly compact in size. Measuring only 12.99 x 6.73 x 8.34 inches (LxWxH), the battery easily fits into various applications without taking up too much space or weighing down your equipment.

It weighs just 60 pounds. This makes installing the product effortless regardless of where you need it to go.

100% Compatible with All 12V Equipment

One of the great advantages of purchasing this lead acid battery from WEIZE is that it’s compatible with all types of equipment running on 12 volts, from sump pumps to vehicles and more.

This means that you won’t encounter compatibility issues, as this powerful battery works seamlessly with all types of machinery requiring 12 volts of power.

Long Life Span and Maintenance Free Operation

Due to its superior construction quality and spill-proof design, the WEIZE ‎QS12-100-T deep cycle battery offers a long lifespan when used correctly. This means less money spent on replacements over time as the battery will last longer than many others on the market today.

What’s more, there’s no need for regular maintenance or refilling either. Install the product once and let it do its job without any trouble at all.

Quality Product with Reliable Service

When you purchase a WEIZE deep-cycle battery, you can be sure you’re getting a quality product backed by reliable service. The product has a warranty, so you can feel secure knowing that your investment is protected if anything goes wrong.

Plus, WEIZE offers quality customer service, ensuring that any questions or concerns are addressed in a timely manner.

Positive Things:

  • 100% compatible with equipment that uses 12 volts
  • SLA battery offers a long lifespan
  • Can fit various commercial and personal equipment
  • A spill-proof design that requires no maintenance
  • Quality products with quality customer service


  • Heavy loads without a full charge can deplete batteries.

2. BASEMENT WATCHDOG BW-27 AGM Sump Pump Deep Cycle Battery

BASEMENT WATCHDOG BW-27 AGM Sump Pump Deep Cycle Battery

The Basement Watchdog high-performance battery for reliable, long-lasting performance requires minimal maintenance and upkeep. Powered by sealed lead acid technology with a spill-proof design, this heavy-duty 12-volt power source is designed to work with countless sump pumps.

Key Features:

  • Battery Cell: Sealed Lead Acid
  • Amperage: 75Ah
  • Terminal: M6 Bolts
  • Battery Weight: 49.82 Pounds
  • Dimensions (LxWxH): 12 x 8 x 12 Inches

Superior Quality Lead Acid Battery Cell

The Basement Watchdog BW-27 AGM (Absorbed Glass Mat) sump pump battery features a powerful 100Ah Lead Acid cell that delivers maximum performance and efficiency.

This high-caliber battery cell ensures reliable power delivery even under heavy loads, making it perfect for powering your essential appliances or devices at home or in your business.

Low Maintenance Design

The Basement Watchdog BW-27 AGM deep cycle sump pump battery also offers an efficient, low-maintenance solution for powering your pump or other equipment. Unlike some other batteries, the spill-proof design of this SLA battery eliminates the need for regular maintenance and allows you to use it without any hassle.

Plus, there is no need to worry about refilling water levels as the cells remain sealed throughout their lifespan.

Versatile Design Fits Various Equipment

The BW-27 AGM batteries come compact, measuring 12.99 x 6.73 x 8.34 inches and weighing only 60 pounds. This allows it to fit into different commercial and personal equipment types, such as UPS systems, telecommunication systems, wheelchairs, electric vehicles, etc.

Using it will provide greater convenience and flexibility when powering your equipment.

Quality Products with Quality Customer Service

Basement Watchdog takes great pride in delivering quality products along with its outstanding customer service solutions to ensure that all of its customers are well taken care of.

Their team of experts is available 24/7 to provide helpful advice on selecting the right product for your requirements and offer support during installation or troubleshooting issues with your device or system.

Positive Things:

  • Reliable backup power for sump pumps
  • Deep cycle technology for efficient power usage
  • Sealed and spill-proof construction
  • It can be used with other brands of sump pumps
  • Easy to install and operate


  • Expensive compared to standard batteries
  • Requires periodic charging to maintain performance

3. BASEMENT WATCHDOG Deep Cycle Lead Acid Battery for Sump Pump

BASEMENT WATCHDOG Deep Cycle Lead Acid Battery for Sump Pump

Protect and extend the life of your sump pump with the Basement Watchdog 24EP6 deep cycle battery. With its standby construction, peak charge maintenance design, and fluid sensor offering visual alerts, this battery is the best value option for providing reliable power for extended periods.

Key Features:

  • Battery Cell: Lead Acid
  • Amperage: 25Ah
  • Terminal: HPT
  • Battery Weight: 20 Pounds
  • Dimensions (LxWxH): 11.75 x 7 x 10.5 Inches

Long-Lasting Performance

The Basement Watchdog lead acid battery is designed with a standby construction that helps extend its life expectancy and reduce overall maintenance costs. The heavy-duty construction ensures the battery can handle high temperatures and frequent cycling without any issues or damage.

Also, it has a low self-discharge rate, so you won’t need frequent recharging to keep it operating at full capacity.

Peak Charge Maintenance Design

This deep cycle lead acid battery also features a special peak charge maintenance design which prevents overcharging of the cells and helps maintain the good health of the battery over time. You need a good battery charger that can handle peak charges to do that.

Plus, the integrated electronic protection system helps protect against short-circuiting and other safety concerns related to overcharging or incorrect connection of the terminals.

Visual Alerts With Built-In Fluid Sensor

The Basement Watchdog deep cycle lead acid battery also offers peace of mind with its built-in fluid sensors, which provide visual alerts if there are any issues with the cell’s water level or any other problem that requires attention.

This feature makes it easy to monitor and adjust water levels as needed without having to check each cell regularly manually. When it comes to convenience, this is a big plus.

Ideal For High Power Demands

This powerful deep-cycle lead acid battery is rated at 25 Ah and has a total weight of 20 pounds, perfect for handling high power demands from your sump pump while remaining lightweight enough for easy maneuverability or relocation if necessary.

Its dimensions (11.75 x 7 x 10.5 inches) make it ideally suited for most standard applications where space may also be an issue.

Affordable Price & Quality Construction

The Basement Watchdog 24EP6 battery provides high quality at an affordable price point, making it an ideal choice for anyone looking for reliable sump pump backup power on a budget. A warranty also backs it, so there are no worries about unexpected repair bills if something goes wrong.

Positive Things:

  • High quality at an affordable price
  • Standby construction allows it to last longer
  • Peak charge maintenance design ensures battery health
  • The exclusive fluid sensor included for visual maintenance alerts
  • Provides peace of mind during power outages or pump failures


  • Short lifespan compared to other commercially available options.

4. PumpSpy Best 75Ah AGM Deep Cycle Battery for Sump Pump

PumpSpy Best 75Ah AGM Deep Cycle Battery for Sump Pump

With unbeatable longevity and superior performance, the PumpSpy 75Ah battery is your go-to source for sump pumps and other energy needs. Featuring advanced lead-acid technology and a unique electrolyte formula, it’s our runner-up selection on our list due to its exceptional power.

Key Features:

  • Battery Cell: Lead-Acid, AGM
  • Amperage: 75Ah
  • Terminal: M6 Bolts
  • Battery Weight: 50 Pounds
  • Dimensions (LxWxH): 10.25 x 6.75 x 8.25 Inches

Superior Lead-Acid Technology

The PumpSpy PS1275 battery utilizes advanced lead-acid technology to provide superior performance with a long life cycle. This technology eliminates spilled acid and hydrogen gas while providing low internal resistance for higher discharge currents.

It also ensures stable battery capacity due to its improved electrolyte formula. This means it can last up to five times longer than traditional flooded batteries, giving you more time between charges.

Versatile Efficiency

With its lightweight design and M6 bolt terminals, the PumpSpy 75Ah AGM batteries can be used in any position without requiring special maintenance. Its small size makes it easy to store and transport, making it an ideal choice for sump pumps and other applications where space is at a premium.

The battery’s low self-discharge rate also helps prevent unnecessary waste of energy when not in use. This is ideal for outdoor lighting or security systems where frequent use is unnecessary.

Maximum Durability

The PumpSpy deep cycle battery provides maximum durability due to its robust construction and premium materials. With a weight of only 50 pounds and dimensions of 10.25 x 6.75 x 8.25 inches, this battery is designed to withstand harsh conditions without sacrificing performance or reliability over time.

It has been tested extensively in extreme temperatures and environments, so you can rest assured that your sump pump will have reliable power even during the most challenging conditions.

Easy Installation

Installing the PumpSpy best 75Ah AGM deep cycle battery for sump pumps is really easy due to the simple setup process and user-friendly instructions.

All necessary components are included with the purchase, so you won’t need to find additional parts or tools before installing your sump pump’s new power source.

The battery also includes detailed instructions for adequately operating your sump pump system, ensuring maximum performance from your new battery every single time you use it.

Positive Things:

  • Eliminates spilled acid and hydrogen gas
  • Low internal resistance for high discharge currents
  • It can be used in any position
  • Stable battery capacity due to improved electrolyte formula
  • Compared to flooded batteries, this is 5x faster


  • Terminal bolt size and threads can be tricky to determine.

5. MK 12 Volt Deep Cycle Marine Sump Pump Battery

MK 12 Volt Deep Cycle Marine Sump Pump Battery

When powering essential equipment, the MK 12-volt deep cycle battery ensures critical applications stay running. Gel cell technology provides exceptional sump pump performance in harsh environments with this robust and reliable battery.

Key Features:

  • Battery Cell: Gel Cell
  • Amperage: ‎88Ah
  • Terminal: LT
  • Battery Weight: 63 Pounds
  • Dimensions (LxWxH): 12.75 x 6.75 x 9.25 Inches

Maintenance-Free Gel Cell Technology

The MK sump pump gel batteries utilize advanced gel cell technology, making them maintenance-free and easy to use in challenging marine environments.

Battery maintenance is not required with the MK, unlike conventional lead acid cells, which require frequent topping up with distilled water or electrolyte solution.

Reliable 12-Volt Capacity

This battery provides an impressive 88Ah capacity at 12 volts, enough to power essential equipment on boats or in other marine applications where backup power may be necessary. With its high watt-hour rating, this battery can provide plenty of power over extended periods without needing to be recharged frequently.

Shock & Vibration Resistant Design

Built with resilient construction materials, the MK ‎E27 SLD G sump pump battery is resistant to shock and vibration. Its common problems are encountered in harsh marine environments where many other batteries fail quickly due to poorer construction quality.

This makes the MK an excellent choice when reliability and safety are top priorities in your application needs.

Wide Temperature Range Operation

As temperatures fluctuate between extremes while out on the water or working in remote areas, it’s crucial to have a battery that can perform reliably despite these temperature changes.

The MK offers exceptional performance across wide temperature ranges, so you don’t have to worry about your battery failing due to extreme hot or cold weather conditions.

Ideal Size and Weight Ratio

Despite its powerful 88Ah capacity rating, the MK weighs only 63 pounds making it easy to transport from one location to another without requiring any heavy lifting assistance or bulky equipment transportation systems like forklifts or cranes for loading/unloading purposes.

Also, with dimensions measuring 12.75 x 6.75 x 9.25 inches, this compact size easily fits into tight spaces while offering plenty of reserve power wherever you go.

Positive Things:

  • Gel cell battery technology for maintenance-free operation
  • It can be used as a backup for sump pumps
  • 12-volt capacity for reliable power
  • Resistant to shock and vibration
  • Operates in a wide temperature range


  • Expensive compared to other lead acid batteries.

Comparison Table for the Best Sump Pump Batteries

ProductBattery CellAmpTerminalBattery WeightDimensions (LxWxH)
WEIZELead Acid100AhM8 Bolts60 Pounds12.99 x 6.73 x 8.34 Inches
Basement Watchdog BW-27 AGMSealed Lead Acid75AhM6 Bolts49.82 Pounds12 x 8 x 12 Inches
Basement Watchdog 24EP6Lead Acid25AhHPT20 Pounds11.75 x 7 x 10.5 Inches
PumpSpyLead Acid, AGM75AhM6 Bolts50 Pounds10.25 x 6.75 x 8.25 Inches
MKGel88AhLT63 Pounds12.75 x 6.75 x 9.25 Inches

Buying Guide for the Best Deep Cycle Battery for Backup Sump Pump

Buying Guide for the Best Deep Cycle Battery for Backup Sump Pump

Having a reliable and high-capacity deep cycle battery can mean the difference between having a functioning sump pump when needed or being left with a flooded basement after even modest rainfall.

Here are some essential tips to consider when looking for the best backup sump pump battery with the highest level of performance and reliability:

01: Battery Type

When choosing a battery for your backup sump pump, the most common types you’ll encounter are lead-acid and lithium-ion batteries.

Lead-acid batteries are the most common choice due to their affordability and reliable performance. They require regular maintenance, such as checking the electrolyte levels and charging as needed.

Lithium-ion batteries offer many advantages over lead-acid batteries, including lightweight, longer lifespans, and less maintenance. Although they tend to be more expensive initially, they often save time and money in the long run due to low maintenance requirements.

But they are not a good choice for high-drain applications, such as sump pumps, as they are not designed to handle the high current draw.

02: Battery Capacity

The capacity of a battery is an essential factor when choosing the best sump pump battery system because it will determine how much power it can store at one time.

This capacity is usually measured in ampere-hours (Ah) and should meet the needs of your backup sump pump while also providing sufficient energy during a power outage.

When calculating what size battery you need for your system, consider its maximum current draw and how long it needs to keep pumping in an emergency situation.

03: Battery Voltage

Your backup sump pump needs to be powered by a battery with the correct voltage to function properly. Most pumps require 12 volts, so make sure that any battery you purchase has this rating before purchasing or installing it into your system.

Also, ensure that all wiring connections and hardware components are compatible with 12 volts before using them with your sump pump.

04: Battery Weight & Dimensions

Battery Weight & Dimensions

When selecting the best battery for a backup sump pump, weight and dimensions are important factors to consider. A lighter battery is easier to transport and maneuver into place when installing it in the system.

Before considering the size of the battery, be sure to consider where it will fit within the system and what kind of space you have available. Also, weight can affect how frequently the battery needs to be replaced due to wear and tear on its components over time.

05: Compatibility with Equipment

Any battery selected for a backup sump pump system must be 100% compatible with existing equipment to ensure the system’s proper functioning. Compatible batteries should run on 12 volts of energy or may not work as intended due to incompatible voltage levels.

Also, it is crucial to read through product specifications prior to purchasing to get an understanding of compatibility between the two components.

06: Advanced Features

When selecting a deep cycle battery for a backup sump pump system, advanced features should also be considered.

The best marine battery for a backup sump pump comes with additional features such as peak charge maintenance designs, fluid sensors that alert users, spill-proof construction, resistance to shock & vibration and more.

These features can help extend the life of your battery and provide added protection from potential damage caused by power outages or other disruptions in service that could affect your system’s performance.

07: Maintenance Requirements

When purchasing a deep cycle battery for a backup sump pump, it is vital to understand the maintenance requirements. Some batteries require regular maintenance, such as adding water to the cells or periodic charging, while others are maintenance-free.

Consider how much time and energy you will dedicate to maintaining your battery. If you don’t have the resources or desire to take on this responsibility, opting for a maintenance-free battery may be best for you.

Also, some batteries may require special cleaning products or other materials to keep them functioning optimally. Researching the individual needs of each type of battery can help you make an informed decision when purchasing.

08: Price

Price is essential when choosing a deep cycle battery for a backup sump pump. Finding a battery that fits your budget without sacrificing quality is essential. It is also important to remember that the cheapest option may not always be the most cost-effective in the long run.

Cheaper batteries often have shorter lifespans and require more frequent replacements than expensive models. Consider all of your options before committing to any one purchase. Ensuring that your chosen battery has longevity and meets all your requirements can save you money.

How Long Will A 12V Battery Run A Sump Pump?

How Long Will A 12V Battery Run A Sump Pump

A 12V battery, such as a deep cycle marine or wet cell battery, can power a sump pump for a reasonable time. If the sump pump is running continuously, the battery should last around 5 to 7 hours before needing to be recharged.

For non-continuous operations, such as when the power goes out and the sump pump is only used intermittently, the battery should last for more than 1 to 3 days until recharging.

It’s important to note that the actual run time may vary depending on factors such as the type and size of the battery, how often it is used, and environmental conditions.

How Long Will 40 Ah Deep Cycle Battery Operate A Sump Pump If Power Goes Out?

A 40Ah deep cycle battery is capable of providing up to four hours of continuous pumping before the water enters your basement in the event that power goes out.

This number is lower than what would be available with larger capacity batteries, such as those rated at 100Ah, which are typically considered the best marine batteries for sump pumps.

When choosing the right size deep cycle wet cell batteries for your needs, you should look at your requirements and budget to get maximum protection and optimal performance from your system.

How often should you replace the backup battery for your sump pump?

How often should you replace the backup battery for your sump pump?

For optimum performance and longevity, lead acid backup batteries for sump pumps should be replaced every five years.

As with all batteries, their capacity gradually decreases over time, meaning they won’t last as long between charges or provide as much protection if needed during emergencies such as power outages.

Batteries are also vulnerable to extreme temperatures, which can reduce their lifespan further, so replacing them periodically ensures you have fresh and reliable batteries ready in case you need them most.

How Often Do You Need To Check a Sump Pump AGM Battery?

Keeping your sump pump AGM batteries properly charged is essential to prevent water damage to your home.

The frequency of these checks should depend on the type and condition of your battery, but it is generally recommended to check them every four to six months.

During these inspections, you should look for any signs of corrosion or acid build-up and measure the levels of electrolytes inside the battery. If any part of the battery appears damaged or the electrolyte levels are low, top off your battery with distilled water to maintain proper power levels.

Also, you should always double-check that all wiring connections are secure and in good working order before leaving your home in case of flooding or other emergencies.

Is a Battery Backup Sump Pump Worth It?

Is a Battery Backup Sump Pump Worth It

A quality battery backup sump pump can prove invaluable when protecting your home against flooding and water damage. With the best battery for a backup sump pump, you can keep your home secure during power outages and in an emergency.

When considering whether or not to invest in a battery for sump pump backup, you must choose one that is compatible with the pump’s specifications and has enough power reserve to keep it running during an outage.

Also, regularly check and maintain the electrical connections between the pump and its associated components and occasionally inspect its interior components, such as electrolyte levels and corrosion.

By following these simple steps, you can be sure that your investment will pay off in terms of security and reliability.

Get the Perfect Deep Cycle Battery for Your Sump Pump

When choosing a reliable and efficient deep cycle battery for your sump pump, there are many factors to consider. These factors include capacity, voltage, amp rating, weight, dimensions, compatibility with equipment, maintenance requirements and more.

We have outlined the top-rated deep cycle batteries that will meet your needs and help you make an informed decision. Out of all the options, we highly recommend the WEIZE ‎QS12-100-T 12V deep cycle battery.

It is lightweight and maintenance-free, with a 100Ah capacity that ensures your sump pumps always have enough power. So, choosing a WEIZE 12V deep cycle battery will offer hassle-free sump pump operation at an affordable price.

WEIZE 12V 100AH Deep Cycle AGM SLA VRLA Battery for Solar System RV Camping Trolling Motor

● Battery Cell: Lead Acid
● Amperage: 100Ah
● Terminal: M8 Bolts
● Battery Weight: 60 Pounds
● Dimensions (LxWxH): 12.99 x 6.73 x 8.34 Inches

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