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Rectangular sealed lead-acid battery block, grey plastic case, two terminal posts on top

PowerWarehouse

PowerWarehouse RB1290X2-PW replacement battery for CyberPower UPS

SKU CH-S6M0-QHFQ9

Sealed lead-acid replacement battery for compatible CyberPower UPS units, 5.18" L x 5.95" W x 4.10" H, 12 LB

  • Measurements5.18 in L × 5.95 in W × 4.1 in H
  • Compatible withCP1500PFCLCD, BRG1350AVRLCD, BRG1500AVRLCD, LX1500GU, CP1350
  • Product weight12 lb (5.44 kg)
  • Drop-in replacement for CyberPower UPS models CP1500PFCLCD, BRG1350AVRLCD, BRG1500AVRLCD, LX1500GU, CP1350AVRLCD, CP1500AVRLCD, CST150XLU
  • Maintenance-free sealed lead-acid design prevents leaks and requires no upkeep
  • Fits existing battery compartment at 5.18" L x 5.95" W x 4.10" H
  • Weighs 12 LB for stable mounting in rack or tower units
  • Backed by 18 month manufacturer warranty from USA-based PowerWarehouse

Replacement Battery for CyberPower UPS

The PowerWarehouse RB1290X2-PW is a new sealed lead-acid battery built to replace the RB1290X2 in compatible CyberPower uninterruptible power supplies. It fits the CP1500PFCLCD, BRG1350AVRLCD, BRG1500AVRLCD, LX1500GU, CP1350AVRLCD, CP1500AVRLCD and CST150XLU models. Buyers who need a different form factor or voltage should look elsewhere.

Sustained Load Behaviour

The maintenance-free sealed lead-acid chemistry delivers steady voltage during extended outages without the leakage risk of flooded cells. Internal resistance remains stable over repeated discharge cycles, so runtime stays predictable across the battery's service life. It is not designed for high-rate cyclic applications such as solar storage or electric vehicles.

Installation and Common Issues

The unit measures 5.18" L x 5.95" W x 4.10" H and weighs 12 LB, so verify the UPS battery compartment dimensions before ordering. Disconnect the UPS from mains power and remove the old pack before connecting the new terminals, observing polarity markings. A loose terminal or reversed polarity will prevent the UPS from starting.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $50.99
Pricier than about 82% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand namePowerwarehouse
Model nameRB1290 × 2-PW
Part numberRB1290 × 2-PW
Size & build
Measurements5.18 in L × 5.95 in W × 4.1 in H
Product weight12 lb (5.44 kg)
Compatibility
Compatible withCP1500PFCLCD, BRG1350AVRLCD, BRG1500AVRLCD, LX1500GU, CP1350AVRLCD, CP1500AVRLCD, CST150XLU

Questions about this item

Does the sealed lead-acid design produce noticeable heat or noise when the UPS runs continuously?

The maintenance-free sealed lead-acid battery operates silently and generates minimal heat during normal UPS operation.

Which CyberPower UPS models must I already own for this RB1290X2-PW pack to fit and connect?

It is compatible with CP1500PFCLCD, BRG1350AVRLCD, BRG1500AVRLCD, LX1500GU, CP1350AVRLCD, CP1500AVRLCD and CST150XLU units.

Will the 5.18" L x 5.95" W x 4.10" H dimensions and existing wiring harness match the older RB1290X2 battery I am replacing?

Yes, the physical size and connector layout are direct replacements for the RB1290X2 pack used in those CyberPower models.

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