How to Replace the RBC48 Battery in APC Smart-UPS SMT750, SMT750US, and SUA750

When it comes to uninterruptible power supply (UPS) units like the APC Smart-UPS SMT750, SMT750US, and SUA750, maintaining optimal performance is essential. Over time, the battery—specifically the RBC48 in these models—will eventually need replacement to ensure reliable backup power, as the standard lifespan of a UPS VRLA battery is typically 3-5 years. Battery longevity depends on usage, room conditions, and the quality of electrical power supplied to the UPS.
This guide provides clear, step-by-step instructions on safely replacing the RBC48 battery in your APC UPS. By following these steps, you can prevent unexpected downtime and protect your equipment during power outages, keeping your setup reliable and efficient.
What is APC RBC48?

The APC RBC48 is a replacement battery cartridge from APC by Schneider, specifically designed for various APC Smart-UPS models such as the SMT750, SMT750US, and SUA750. This cartridge, part of APC’s RBC (Replacement Battery Cartridge) line, extends the life of your UPS by providing dependable backup power when the original battery has depleted.
Key specifications of the RBC48 include:
- Battery Type: Sealed Lead-Acid (VRLA)
- Voltage and Capacity: 12V with a high amp-hour rating (7 Ah) for reliable performance
- Plug-and-Play: Designed for easy installation with connectors and cables that fit directly into compatible UPS units
- Estimated Lifespan: 3-5 years under normal conditions, depending on usage and environmental factors
To replace the battery in an APC UPS model SMT750US, SUA750, or SUA750, it is recommended to use a genuine APC battery to ensure quality and prevent issues that could damage your UPS. APC offers the RBC110 battery type, which has a voltage of 12V and a capacity of 7Ah. You can purchase the RBC48 battery from reputable marketplaces like Amazon.com to ensure you receive an authentic product for optimal performance and reliability.
Amazon offers a wide selection of new APC UPS models that can provide reliable power backup and surge protection for your electronic devices. Here are some popular options available for purchase:
- APC BX1500M: This 1500VA UPS is designed for high-power devices, making it ideal for small business setups or home office environments.

- APC BE600M1: Compact and efficient, this model offers 600VA of backup power and includes additional USB ports, making it perfect for home electronics and smaller devices.

- APC BR1500MS2: With advanced battery management and a sleek design, this 1500VA model is well-suited for home offices and small servers.

- APC BGM1500B-US: Built to handle more demanding power needs, this UPS model provides 1500VA of battery backup and offers versatile connectivity options.

- APC BE500G3: Compact yet effective, this 500VA model provides essential backup for home electronics and networking equipment.

- APC BE1050G3: Ideal for moderate power needs, this 1050VA UPS model is a versatile choice for keeping devices protected.

- APC BVK750M2 This 750VA UPS model offers balanced protection for small home office setups or critical devices.
Here are the steps for replacing the RBC48 battery in the APC UPS models SMT750US, SUA750, and SUA750:

- Remove the Front Panel
Ensure the UPS is turned off and disconnected from any devices for safety. Then, remove the front panel by pulling it out from the bottom to access the battery compartment. - Open the Battery Compartment
Use a tool, such as a screwdriver, if needed to unscrew any fasteners on the battery compartment. Lift the compartment cover to access the internal battery. - Disconnect the Old Battery
Carefully pull the old battery out of the UPS. Gently disconnect the positive and negative connectors from the battery, ensuring you don’t damage the cables or connectors. - Install the New Battery (APC RBC48)
Connect the positive and negative cables to the new APC RBC48 battery, ensuring the connections match the correct polarity. Secure the connectors tightly to prevent any connection issues, then slide the new battery into the compartment. - Reattach the Battery Compartment and Front Panel
Close the battery compartment and tighten any screws if necessary. Reattach the front panel, making sure it’s properly secured. - Power On the UPS and Test
Plug the UPS back into a power source and press the “Power On” button. The UPS should perform a self-check. If installed correctly, you will hear a short beep and see the green “Power On” indicator, confirming that the UPS is functioning correctly.
Charge the Battery:
For optimal performance, it’s recommended to charge the battery for at least 16 hours after installation. The UPS will automatically charge the new battery when plugged into an electrical outlet, whether it is turned on or off. This ensures the battery reaches a full charge and is ready to provide backup power when needed.