APC RBC3 Replacement Battery – 6V 12Ah (2 Pack)

Description

This APC RBC3 replacement battery kit includes (2) 6 Volt 12Ah AGM batteries designed to restore reliable backup power to your UPS system. Built for standby applications, these sealed lead acid batteries deliver consistent performance, long service life, and safe indoor operation.

This kit includes two batteries required to replace one APC RBC3 cartridge. You will need to reuse your existing wiring and cables.

Compatibility

Compatible with select APC Back-UPS systems that use the RBC3 battery cartridge including:

• APC BK450
• APC BK520
• APC BK575C
• APC BK600
• APC BK600C
• APC BK650M
• APC Network Powercell

Always verify battery configuration and dimensions before ordering.

Key Features

• Battery Pack includes 2 x 6V 12Ah AGM Batteries
• Maintenance-free sealed lead acid design
• Spill-proof design installs in any position except upside down
• Pre-charged and ready for installation
• Ideal for backup power systems and emergency power protection

For full technical specifications including dimensions and terminal type, please see our main 6V 12Ah AGM SLA battery page.

FAQ

How do I know if this replaces my APC RBC3 battery?

Check your existing battery pack label for “RBC3” or confirm your UPS model. This replacement uses two 6V 12Ah batteries — if your current pack matches this configuration, it is likely compatible.

Can I replace my RBC3 battery myself?

Yes, most RBC3 battery replacements are straightforward and can be done using your existing wiring and connectors. Always disconnect the UPS from power before replacing the batteries.

How long do RBC3 batteries last?

Most UPS batteries last 3–5 years, depending on usage, temperature, and charging conditions.

APC™ and all APC RBC part numbers are registered trademarks of American Power Conversion. Part numbers listed on this page are for reference purposes only and do not imply endorsement or sponsorship by APC.