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Two black sealed lead-acid batteries in a cartridge, 12V 9Ah each

CyberPower

CyberPower RB1290X2B UPS Replacement Battery 2 x 12V 9Ah

SKU CH-9ZK4-2NMF2 MPN RB1290X2B

Two 12 V 9 Ah sealed lead-acid cells restore runtime to compatible CyberPower UPS units

  • TypeConsumer Electronics
  • CompatibilityRB1290X2B, CyberPower
  • SpecificationsCPS RB1290X2B Replacement Batteries, RB1290X2B, 12 volts, se
  • FeaturesCPS RB1290X2B Replacement Batteries, 18 Month Warranty, 0, s
  • Dimensions14.33in W x 12.83in H x 9.06in D
  • Package Contents1, false
  • Restores UPS runtime with two 12V 9Ah batteries
  • Sealed lead-acid design prevents leaks and needs no fluid
  • Certified to meet or exceed original manufacturer specifications
  • Compact cartridge fits 5.9 x 5.1 x 3.7 inch battery bays
  • 18 month warranty backs long-term reliability

Restore UPS Runtime

The CyberPower RB1290X2B is a replacement battery cartridge containing two 12V 9Ah sealed lead-acid units. It fits compatible CyberPower UPS systems to restore backup power when the original cells have weakened or failed. The leak-proof design never requires fluid replacement and the pack is certified to meet or exceed the original manufacturer specifications. Installation returns the UPS to full runtime capability.

Suitable For Direct Swaps

This cartridge suits owners of CyberPower UPS models that use the RB1290X2B part number and need a like-for-like refresh. It is not for users whose UPS requires a different voltage, capacity or physical layout, nor for anyone attempting to adapt it to non-CyberPower equipment. Buyers should verify the exact part number on their existing battery before ordering.

Two 12V 9Ah Modules

The pack delivers two 12 volt 9 ampere-hour modules in a single cartridge measuring 5.9 L x 5.1 W x 3.7 H inches. This voltage and capacity combination is the decisive specification that determines whether the cartridge matches the UPS. The sealed lead-acid chemistry and leak-proof construction complete the compatibility profile.

Highlights

  • Restores UPS runtime with two 12V 9Ah batteries
  • Sealed lead-acid design prevents leaks and needs no fluid
  • Certified to meet or exceed original manufacturer specifications
  • Compact cartridge fits 5.9 x 5.1 x 3.7 inch battery bays
  • 18 month warranty backs long-term reliability

Specifications

BrandCYBERPOWER SYSTEMS USA
ModelRB1290X2B
Part NumberRB1290X2B
TypeConsumer Electronics
CompatibilityRB1290X2B, CyberPower
SpecificationsCPS RB1290X2B Replacement Batteries, RB1290X2B, 12 volts, sealed_lead_acid, 0, 5.9 L x 5.1 W x 3.7 H inches, 18 Month Warranty, black
FeaturesCPS RB1290X2B Replacement Batteries, 18 Month Warranty, 0, sealed_lead_acid, 12 volts, black
Dimensions14.33in W x 12.83in H x 9.06in D
Package Contents1, false
Shipping weight4.99 kg
Package size205 × 190 × 153 mm

Questions about this item

Does the sealed lead-acid design of the RB1290X2B generate noticeable heat or noise during continuous daily use?

The RB1290X2B uses sealed lead-acid cells with no moving parts, so it runs silently and produces only minimal warmth during normal float charging.

My UPS uses F1/F2 spade terminals — are the RB1290X2B batteries pre-fitted with the correct connectors?

The cartridge arrives with the factory terminals already attached, matching the original CyberPower harness so no extra cables or adapters are needed.

Will the 5.9 × 5.1 × 3.7 inch batteries fit the same tray as the original cells in my older CyberPower unit?

Yes, the RB1290X2B replicates the OEM footprint exactly, so it drops into the existing battery compartment without modification.

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