We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Rectangular sealed lead-acid battery block, grey plastic casing, two cells, 12V rating

Battery Technology Inc.

Battery Technology Inc. RB1290X2 12V 2-Cell Lead Acid UPS Replacement Battery

SKU CH-S6FY-8PHC0

12 V 2-cell lead-acid battery replaces CyberPower RB1290 in compatible UPS models

  • TypeBattery
  • Compatible with CyberPower UPS models including BRG1350AVRLCD and CP1500AVRLCD
  • 12 V lead-acid chemistry delivers reliable backup power for critical equipment
  • Two-cell 1290 configuration fits RB1290X2 battery compartments without modification
  • Designed for BRG1500AVRLCD and LX1500GU units to restore runtime performance
  • Supports CP1350AVRLCD and CST150XLU systems for continuous operation during outages

Battery For CyberPower UPS Models

This 12V 2-cell lead acid battery replaces the CyberPower RB1290 pack in compatible UPS units. It fits the BRG1350AVRLCD, BRG1500AVRLCD, LX1500GU, CP1350AVRLCD, CP1500AVRLCD and CST150XLU models. The pack restores backup runtime when the original cells reach end of life.

Suits Owners Of Listed CyberPower Units

Buyers with one of the six CyberPower models above can install this pack directly. It is not for users who need a different voltage, a higher cell count or a form factor that does not match the RB1290 footprint. Shops looking for generic 12V blocks should verify dimensions first.

Voltage And Cell Count Determine Fit

The pack delivers 12 volts from two lead acid cells wired in series, matching the original RB1290 specification. If your UPS requires a different voltage or a different number of cells this battery will not work. Confirm the RB1290 part number before ordering.

Highlights

  • Compatible with CyberPower UPS models including BRG1350AVRLCD and CP1500AVRLCD
  • 12 V lead-acid chemistry delivers reliable backup power for critical equipment
  • Two-cell 1290 configuration fits RB1290X2 battery compartments without modification
  • Designed for BRG1500AVRLCD and LX1500GU units to restore runtime performance
  • Supports CP1350AVRLCD and CST150XLU systems for continuous operation during outages

Specifications

BrandBattery Technology Inc.
TypeBattery

Questions about this item

How do I install the RB1290X2 12V battery in my CyberPower UPS and which step is most often missed?

Power off and unplug the UPS, open the battery compartment, disconnect the old unit noting polarity, connect the new RB1290X2 leads red-to-red and black-to-black, secure the cover, then recharge for at least eight hours before relying on runtime.

What maintenance or replacement will the RB1290X2 lead-acid battery need over its service life?

Expect to replace the RB1290X2 every three to five years; keep terminals clean, avoid deep discharges, store at full charge if unused, and test voltage periodically — swollen or leaking cases mean immediate replacement.

What runtime limit appears first when the RB1290X2 powers a BRG1500AVRLCD at full 1500 VA load during an extended outage?

At 1500 VA the 12 V 1290 mAh cells deliver only a few minutes before voltage sag triggers UPS shutdown; heat buildup in the sealed lead-acid pack is the first hard limit under sustained maximum draw.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.