CyberPower RB1290X3B UPS Replacement Batteries

The CyberPower RB1290X3B is a genuine replacement battery cartridge that restores full backup power to a compatible CyberPower UPS such as the M1100XL. Installing it gives your existing system the same dependable runtime it had when new, without the cost of replacing the entire unit.

The cartridge arrives fully assembled with three 12-volt 9-amp-hour sealed lead-acid batteries. Because everything is prewired and secured, most users can complete the swap in minutes using only basic tools. That convenience helps data closets, small offices, and home workstations stay protected during maintenance windows instead of facing extended downtime.

The internal construction is leak-proof and maintenance-free, so you do not have to monitor fluid levels or worry about corrosion. Once in place, the battery pack delivers power that meets or exceeds the original factory specification, keeping critical electronics running smoothly through outages and brownouts.

CyberPower supplies reusable packaging that makes it simple to return the spent batteries for responsible recycling. This thoughtful touch reduces waste and helps you comply with local disposal regulations. An 18-month limited warranty backs the cartridge, adding confidence that your UPS will remain reliable through many charge and discharge cycles.

Measuring 7.8 by 5.94 by 4.13 inches and weighing 17.73 pounds, the RB1290X3B slides directly into the UPS battery bay without modification. It is a practical choice for IT managers, remote workers, and anyone who depends on steady power to safeguard files, equipment, and productivity.

• Three sealed lead-acid batteries rated at 12V 9Ah each
• Leak-proof and maintenance-free construction
• Preassembled cartridge for quick user installation
• Compatible with CyberPower M1100XL UPS
• Reusable packaging simplifies battery recycling
• 18-month limited warranty
• Dimensions: 7.8 x 5.94 x 4.13 inches (19.8 x 15.09 x 10.49 cm)
• Weight: 17.73 pounds (8.04 kg)