A sump pump is your home’s first line of defense against basement flooding, but what happens when the power goes out during the worst storm of the year? A power outage can render your primary pump useless, leaving your home vulnerable to thousands of dollars in water damage. A battery backup system is not just an accessory; it’s an essential insurance policy for your basement, providing critical protection when you need it most.
With various options on the market, from simple add-on pumps to smart, connected combo systems, selecting the right one can feel overwhelming. This roundup is designed to simplify your search by highlighting the best battery backup systems available. We’ve evaluated key factors like pumping capacity, smart features, and ease of installation to help you find the perfect safeguard for your home and gain true peace of mind.
Our Top Picks for Sump Pump Battery Backups
- Briidea Battery Backup Sump Pump System with WiFi
- Westinghouse 12 Volt Battery Back Up Sump Pump
- Westinghouse 1/2 HP Sump Pump Battery Backup System
- WAYNE 1/2 HP Basement Sump Pump System with Battery Back Up
- PumpSpy PS2000C SmartPump Combination Wi-Fi Sump Pump
- WAYNE ESP25n 12 Volt Battery Back Up Sump Pump
- Basement Watchdog BWD12-120C Battery Backup Sump Pump System Combo
- Zoeller 507-0005 Aquanot 508 Battery Backup Sump Pump System
Briidea Battery Backup Sump Pump System with WiFi
For homeowners seeking modern, connected protection, the Briidea system offers reliable basement flood protection with advanced smart features. It automatically activates when your main pump fails or water levels rise too high, connecting in parallel without interfering with your existing setup. This provides 24/7 security against water damage, whether you’re facing heavy rain or are away on a trip.
Its built-in dual-band WiFi (compatible with 2.4G and 5G) allows for real-time monitoring from anywhere using the GeniLife App. You’ll receive instant alerts for water level changes, pump faults, or power outages. The high-efficiency DC pump can move up to 2,700 GPH and features an electronic water level sensor for faster response and higher accuracy, along with dry-run protection for reliable performance in extreme weather.
Westinghouse 12 Volt Battery Back Up Sump Pump
The Westinghouse 12 Volt Battery Back Up Sump Pump is a heavy-duty solution designed for straightforward, dependable performance. As a dedicated backup unit, it is built to take over seamlessly when your primary pump loses power. This model is capable of pumping up to 2,700 gallons per hour, providing substantial water removal capacity during an outage.
Its robust construction ensures it can handle the demands of keeping a basement or crawlspace dry during severe weather events. This pump is an excellent choice for those who need a reliable, no-frills backup system that focuses on core functionality and powerful output to protect your property from flooding.
Westinghouse 1/2 HP Sump Pump Battery Backup System
This Westinghouse system is a complete dual-pump solution, combining a powerful primary pump with an integrated backup. The 1/2 HP primary motor is rated for an impressive 5,200 GPH, making it suitable for areas with high water volume. The backup pump system activates during a power outage, removing water at 2,700 GPH to help keep your basement dry.
The efficient design includes a metal bar connecting the pumps, which simplifies installation and adjustments. The volute top suction design helps filter debris, contributing to quieter and more efficient operation. This all-in-one system is an ideal choice for those who want the convenience and reliability of a matched primary and backup pump set.
WAYNE 1/2 HP Basement Sump Pump System with Battery Back Up
WAYNE’s WSS30VN is a robust indoor sump system engineered for heavy water flow, even during a power loss. The 1/2 HP primary pump can move up to 5,100 GPH, providing strong primary protection. Its integrated battery backup capability is a key feature, designed to remove up to 10,000 gallons on a single battery charge.
This model is designed for user-friendly installation, coming preassembled and ready for a drop-in setup that can be completed in about 15 minutes. It fits in a 16-inch diameter or larger sump basin and requires no drilling of a weep hole. This system is a solid, efficient choice from a trusted brand in water removal.
PumpSpy PS2000C SmartPump Combination Wi-Fi Sump Pump
The PumpSpy PS2000C is a high-tech combination system that offers both powerful performance and comprehensive remote monitoring. This pre-assembled system is designed for a fast and easy setup, connecting to an existing 1.5-inch discharge line. It features a primary ½ HP pump that can pump up to 4,320 gallons per hour, backed by a 12V backup pump capable of 3,600 GPH.
Its standout feature is the Wi-Fi connectivity, which allows for 24/7 remote monitoring of both the primary and backup pump performance, as well as battery status. The system even performs automated tests every two days to ensure everything is in working order. With dual backup pump switches for extra protection, this system is for those who want maximum control and awareness.
WAYNE ESP25n 12 Volt Battery Back Up Sump Pump
The WAYNE ESP25n is a dedicated 12-volt backup pump designed for reliability when your main power fails. This model is built to keep your basement dry during heavy water flow caused by rain or snow melt, providing essential protection during a power outage. It can pump up to 2,700 GPH and has the capacity to remove up to 10,000 gallons on a single battery charge.
Its efficient design allows it to fit in 14-inch diameter or larger sump basins, and it requires no drilling of a weep hole. As a standalone backup unit from a reputable brand, the ESP25n is a practical and trusted choice for adding a layer of security to your existing sump pump setup.
Basement Watchdog BWD12-120C Battery Backup Sump Pump System Combo
The Basement Watchdog BWD12-120C is a combination system known for its reliability and smart charging technology. This model pairs a strong primary pump with a dedicated battery-powered backup, ensuring continuous operation. It is designed to provide peace of mind with features that protect both your home and the battery, extending its life.
Many users appreciate its built-in battery maintenance system, which helps prevent battery failure by using a multi-stage charging process. This system is a solid contender for those looking for a robust, all-in-one solution from a brand that specializes in basement water protection.
Zoeller 507-0005 Aquanot 508 Battery Backup Sump Pump System
Zoeller is a highly respected name in the pump industry, and the Aquanot 508 lives up to that reputation for quality and durability. This system is engineered for maximum reliability and is often considered a professional-grade option. It is built with robust components designed for long service life and consistent performance under demanding conditions.
The system features a powerful pump and is compatible with a standard 12V battery. Homeowners who prioritize industrial-grade construction and proven reliability often choose Zoeller for this critical home protection system, making it a top-tier investment for safeguarding your basement.
Buying Guide: How to Choose a Battery Backup for Your Sump Pump
When the power goes out during a heavy storm, your primary sump pump becomes a useless piece of plastic in a hole. That’s a terrifying thought, and it’s exactly why I tell everyone with a basement to get a battery backup system. But with so many options, how do you pick the right one? I’ve spent a lot of time figuring this out, and it really comes down to a few key factors.
First, you need to think about battery type. Most systems use either Absorbent Glass Mat (AGM) batteries or lithium-ion batteries. AGM batteries are the traditional, more affordable choice. They get the job done but are heavier and have a shorter lifespan—typically needing replacement every 3-5 years. Lithium-ion batteries, on the other hand, are the newer tech. They’re lighter, more compact, last much longer (up to 10 years), and can often be discharged more deeply without damage. The upfront cost is higher, but for me, the long-term value and reliability are often worth it.
Next, consider the pump technology itself. Most backup systems come with their own secondary pump. You’ll mainly see two types: centrifugal pumps and diaphragm (or “piggyback”) pumps. Centrifugal pumps are powerful and can move a lot of water, making them great for homes in areas with frequent or heavy flooding. Diaphragm pumps are generally more efficient with the battery power, running for longer periods, but they usually can’t move water as quickly. Think about your specific flood risk to decide which trade-off makes more sense for you.
Run time and pumping capacity are your next big checks. Look at the “gallons per hour” (GPH) rating at a specific lift height (like 10 feet). This tells you how much water the pump can move when the battery is fully charged. More importantly, check how long the system can run. A good system will provide at least 7-10 hours of continuous runtime. If you live where power outages can last for days, you might want a system that allows for extra battery packs to extend that runtime significantly.
Finally, don’t ignore the extra features. An alarm—either audible or sent to your phone—that warns you of pump failure, high water, or a low battery is absolutely essential. I also look for units with a built-in battery charger and maintenance mode to keep the battery healthy. Some modern systems even offer Wi-Fi connectivity, letting you monitor your pump’s status from anywhere. When you’re looking at the 8 best battery backup systems for existing sump pumps 2025, matching these features to your home’s needs and your peace of mind is the ultimate goal.
Frequently Asked Questions
Can I install a battery backup system myself?
Maybe, but I usually recommend hiring a professional plumber or electrician, especially if you’re not comfortable working with plumbing and electrical systems. A proper installation is critical. It involves connecting the backup pump to your existing discharge pipe, ensuring check valves are installed correctly to prevent backflow, and wiring it to a dedicated electrical outlet. A mistake could lead to a leak or an electrical hazard, which is the last thing you need during a flood.
How often does the battery need to be replaced?
This depends entirely on the battery type. For standard AGM lead-acid batteries, you should plan on replacing them every 3 to 5 years. They degrade over time, even if they aren’t used frequently. If you opt for a system with a lithium-ion battery, you can expect a much longer service life, often around 10 years. It’s a good habit to test your entire backup system every few months and check the battery’s status indicator to ensure it’s holding a charge.
Will a backup system work if my primary pump fails mechanically?
Yes, and this is a huge benefit that people often overlook! A battery backup system is a completely independent unit with its own pump, float switch, and power source. So, if your main AC-powered pump burns out its motor, gets stuck, or its float switch fails, the backup system will detect the rising water and kick in automatically. It’s your true fail-safe against any kind of sump pump failure, not just a power outage.
What is the difference between a water-powered and a battery-powered backup?
This is a common point of confusion. A battery-powered backup uses a dedicated battery (like a large car battery) to run a secondary electric pump. A water-powered backup, often called a “water-powered sump pump,” uses the pressure from your municipal water supply to create a suction that pulls water from the sump pit. The big advantage of a water-powered unit is that it will run indefinitely as long as your city water is on. However, it uses a lot of water (which you may be billed for), requires high water pressure to be effective, and is often not allowed by code in areas with septic systems. For most people, a robust battery system is the more straightforward and reliable choice for finding one of the 8 best battery backup systems for existing sump pumps 2025.
How much should I expect to spend on a good system?
You can find basic battery backup units starting around $200, but for a reliable system with a decent pump and a good quality battery, I’d set a budget between $500 and $1,000. High-end systems with lithium-ion batteries, Wi-Fi monitoring, and the ability to connect multiple battery extensions can cost $1,500 or more. Think of it as an insurance policy for your basement; investing in a quality system now can save you tens of thousands of dollars in water damage later.