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
Three black sealed lead-acid batteries in a rectangular cartridge

CyberPower

CyberPower RB1290X3R ups replacement battery 12V 9Ah 3 pack

SKU CH-DQ9E-GSS78 MPN RB1290X3R

Three sealed lead-acid 12 V 9 Ah batteries restore power to compatible CyberPower UPS units

  • Product typeBattery
  • Compatible with36V60ART2U (Also requires the RB1290 × 3L)
  • DetailsBattery Type: Sealed Lead-Acid Battery Size: 12 V/9Ah User R
  • Key featuresThe RB1290 × 3R UPS Replacement Battery Cartridge restores l
  • Product dimensions7.6 in × 13.1 in × 3.2 in
  • Product weight18 lb (8.16 kg)
  • Restores UPS runtime with certified 12V 9Ah sealed lead-acid cells
  • Three-battery cartridge replaces depleted units in compatible CyberPower systems
  • Pre-assembled design enables user installation without tools or fluid maintenance
  • Leak-proof sealed construction eliminates electrolyte handling and refill requirements
  • Ships in reusable packaging for convenient battery recycling returns

Compatible UPS cartridge

The RB1290X3R is a pre-assembled replacement cartridge designed for the 36V60ART2U UPS system. It contains three 12V 9Ah sealed lead-acid batteries that are user-replaceable and certified to meet original specifications. The leak-proof design never requires fluid maintenance. Reusable packaging is included for recycling the expired units.

Voltage and capacity match

Each battery in the pack delivers 12 volts and 9 ampere-hours, combining to the 36 volts required by the compatible UPS. This exact voltage and capacity pairing is the single specification that determines whether the cartridge will restore full runtime. Using a different voltage or ampere-hour rating would prevent the UPS from operating correctly.

Drop-in installation

The cartridge measures 7.60 by 13.10 by 3.20 inches and weighs 18.00 pounds, fitting directly into the 36V60ART2U chassis without modification. It requires the companion RB1290X3L cartridge to complete the battery string. Installation frees the UPS from depleted cells and restores backup power for connected equipment.

How it compares

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

Price $266.99
Pricier than about 90% of the 3,915 comparable items (median $39.99).

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

Specifications

Product
Brand nameCyberPower
Model nameRB1290 × 3R
Product typeBattery
Size & build
Product dimensions7.6 in × 13.1 in × 3.2 in
Product weight18 lb (8.16 kg)
Shipping weight9.66 kg
Package size455 × 259 × 178 mm
Compatibility
Compatible with36V60ART2U (Also requires the RB1290 × 3L)

Questions about this item

What runtime does the 12 V 9 Ah rating deliver in a 36 V UPS?

Three 12 V 9 Ah batteries wired in series provide the 36 V bus voltage required by the 36V60ART2U UPS; capacity remains 9 Ah, so runtime matches the original cartridge under identical load.

How does the series connection affect the 36 V system voltage?

Each battery contributes 12 V; linking all three creates the 36 V string the UPS expects, while the 9 Ah rating stays unchanged.

Will the 7.60" x 13.10" x 3.20" cartridge fit my UPS battery bay?

The pre-assembled cartridge matches the original dimensions of 7.60 by 13.10 by 3.20 inches, so it slides into the same compartment without modification.

More in UPS Replacement Batteries

Similar items