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Two sealed lead-acid batteries in a plastic cartridge, 6.1 by 2.56 by 8.1 inches

CyberPower

CyberPower RB1290X2D UPS Replacement Battery 2x 12V 9Ah

SKU CH-2J80-8RQYF MPN RB1290X2D

Two sealed lead-acid batteries totalling 12 V 9 Ah fit the CP1500PFCRM2U UPS and are user-replaceable

  • Product typeBattery
  • Compatible withCP1500PFCRM2U
  • DetailsBattery Size: 12 V / 9 Ah Battery Type: Sealed Lead-Acid Bat
  • Product dimensions2.56 in × 6.1 in × 8.1 in
  • Product weight11.8 lb (5.35 kg)
  • In the boxRB1290 × 2D Battery Kit Installation Guide
  • User-replaceable design simplifies maintenance without tools
  • Two sealed lead-acid units deliver 12V 9Ah each for CP1500PFCRM2U
  • Leak-proof casing protects equipment from electrolyte spills
  • Compact 2.56 x 6.1 x 8.1 inch footprint fits standard rack trays
  • Ready-to-install kit includes battery cartridge and installation guide

Direct Replacement for CP1500PFCRM2U

This kit contains two sealed lead-acid units rated at 12 V and 9 Ah each. It is designed specifically for the CyberPower CP1500PFCRM2U uninterruptible power supply. The cartridge format allows a single swap without tools or soldering.

Sealed Lead-Acid Chemistry Limits Runtime

The 9 Ah capacity sets a fixed energy ceiling that cannot be expanded within the same chassis. Sealed lead-acid cells self-discharge over months of storage and lose capacity after repeated deep cycles. Runtime scales linearly with load, so heavier draws shorten backup time predictably.

Leak-Proof Casing and User-Replaceable Design

Each battery is housed in a plastic shell measuring 6.1 by 2.56 by 8.1 inches and weighing 11.8 lbs. The leak-proof construction prevents electrolyte escape during handling or vibration. Front-access terminals and the included guide let technicians exchange the pack while the UPS remains rack-mounted.

How it compares

Measured against everything we stock in UPS Replacement Batteries, at today’s prices. Recalculated every night.

Price $109.99
Pricier than about 78% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand nameCyberPower
Model nameRB1290 × 2D
Part numberRB1290 × 2D
Product typeBattery
Size & build
Product dimensions2.56 in × 6.1 in × 8.1 in
Product weight11.8 lb (5.35 kg)
Shipping weight5.73 kg
Package size305 × 250 × 93 mm
Compatibility
Compatible withCP1500PFCRM2U
In the box
In the boxRB1290 × 2D Battery Kit
Installation Guide

Questions about this item

This kit contains two 12 V 9 Ah batteries — is that the only capacity option for the CP1500PFCRM2U?

Yes, the RB1290X2D is supplied as a matched pair of 12 V 9 Ah sealed lead-acid cells and is the specified replacement cartridge for the CP1500PFCRM2U.

What runtime can I expect from the 9 Ah rating once the cartridge is installed in my CP1500PFCRM2U?

The 9 Ah rating shows the total charge each cell can deliver; actual runtime depends on the load your UPS is supporting at the time of an outage.

The batteries connect through the UPS’s internal bus — does that impose any practical limit on charge or discharge current?

The CP1500PFCRM2U manages charge and discharge rates internally, so the cartridge operates within the UPS’s designed current limits.

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