10 Best Sump Pump Battery Backups 2025 in the United States

The BASEMENT WATCHDOG Model BW-27AGM is a maintenance-free sump pump battery, which means you don't need to add any battery fluid or distilled water, making it hassle-free to use. It offers significant protection duration, with up to 40 hours for the Big Dog system, up to 48 hours for the Special + and Big Combination systems, and up to 80 hours for the Emergency and Combination systems, assuming a 10% duty cycle. This makes it highly reliable during power outages.

The battery is compatible with various Basement Watchdog sump pump systems, including older versions purchased before 2014, provided they have a Remote Terminal. However, using it with older non-compatible systems might trigger false alarms, which is something to consider. The battery is a sealed lead acid type, which is known for its durability and safety.

The ease of installation is generally good, but its weight of 22.6 kg (about 49.7 pounds) might make handling it a bit challenging for some users. It comes with a 12V battery included, which is convenient. In terms of drawbacks, the battery's weight could be a factor, and it may not be compatible with all older systems, possibly causing false alarms. For those with compatible systems, it provides a robust and maintenance-free power backup solution.

The Basement Watchdog Big Combo CONNECT Model CITS-50 is a robust sump pump system that combines a primary pump with a battery backup, making it a strong choice for homeowners concerned about flooding. The ½ HP primary pump is energy-efficient and has an impressive capacity, moving up to 3,540 gallons per hour at a 10-foot lift, which is ideal for handling significant water influx during storms.

One of the standout features is its WiFi capability, allowing users to monitor the pump and its battery status 24/7. This means you can receive real-time alerts on your phone or through email, which is great for peace of mind, especially if you’re not always at home. The included alarm system further enhances this, providing audio and visual warnings for maintenance needs.

When it comes to battery support, this system is versatile, accommodating both maintenance-free AGM and wet-cell batteries. Users can even connect two batteries for extended run time, which is a big plus if you live in an area prone to power outages. The requirement for a separate purchase of the Basement Watchdog CONNECT Module for advanced alerts may surprise some users looking for a fully inclusive system. Additionally, while the installation is generally straightforward, it might still present challenges for those not comfortable with DIY projects.

The WAYNE 1/2 HP Basement Sump Pump System is designed for indoor use, making it a good choice for homeowners looking to keep their basements dry during heavy rains or snow melts. One of its standout features is its impressive pumping capability, able to handle up to 5,100 gallons per hour, which is beneficial for managing large amounts of water quickly. Additionally, the system can remove about 10,000 gallons on a single battery backup charge, ensuring your basement stays dry even during power outages, although you'll need to purchase the battery separately.

Installation is made easy with a preassembled design that allows for drop-in setup in about 15 minutes. This is a big plus for those who aren't very handy, as it requires no drilling or complex setup. The unit has been tested for durability, lasting through a million cycles, which speaks to its reliability over time. The three-year warranty adds to the peace of mind for buyers.

However, there are some considerations to keep in mind. The fact that the battery is sold separately can be inconvenient and adds to the overall cost. Plus, it's important to note that this model is designed strictly for indoor use, which might not suit those looking for a more versatile option for outdoor spaces. With a maximum lifting height of 20 feet, it should meet the needs of most basements, but some may find it lacking in certain extreme conditions.