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Rectangular sealed lead-acid battery pack, eight cells, grey plastic housing

CyberPower

CyberPower RB1290X8 UPS Replacement Battery 8x12V/9Ah SLA

SKU CH-K55M-MK3ZY MPN RB1290X8

Eight sealed lead-acid batteries rated 12 V / 9 Ah for CyberPower OL8KRTHD and OL10KRTHD UPS units

  • Product typeBattery
  • Compatible withCyberPower OL8KRTHD, OL10KRTHD
  • DetailsBattery Battery Quantity: 8 Battery Size: 12 V / 9 Ah Batter
  • Product dimensions4.2 in × 6.1 in × 22.1 in
  • Product weight48 lb (21.8 kg)
  • Eight sealed lead-acid cells keep critical UPS units running
  • 12 V 9 Ah rating matches original specifications for OL8KRTHD and OL10KRTHD
  • User-replaceable cartridge lets you swap batteries without tools
  • Operates reliably from 32 to 104 °F in 0 to 90 % humidity
  • Compact 4.2 x 6.1 x 22.1 in form fits existing battery bays

Eight-battery cartridge for CyberPower OL UPS

The RB1290X8 is a user-replaceable cartridge containing eight sealed lead-acid cells rated at 12 volts and 9 amp-hours each. It is built to fit the CyberPower OL8KRTHD and OL10KRTHD uninterruptible power supplies. The unit weighs 48 pounds and measures 4.2 by 6.1 by 22.1 inches.

Sealed lead-acid chemistry and environmental limits

The batteries operate safely between 32 and 104 degrees Fahrenheit with relative humidity up to 90 percent non-condensing. There are no USB charge ports on the cartridge. Sealed lead-acid technology requires no routine fluid maintenance but will degrade if stored in a discharged state or exposed to temperatures outside the rated range.

9 Ah per cell for runtime headroom

Eight cells at 9 amp-hours provide the reserve capacity designed for the compatible OL-series units. Runtime scales with the load applied by the connected equipment; heavier loads draw the reserve down faster. The cartridge is not suited for UPS models outside the listed compatibility and cannot be split for use in smaller units.

How it compares

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

Price $751.99
Pricier than about 91% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand nameCyberPower
Model nameRB1290 × 8
Product typeBattery
Size & build
Product dimensions4.2 in × 6.1 in × 22.1 in
Product weight48 lb (21.8 kg)
Shipping weight23.27 kg
Package size681 × 274 × 244 mm
Compatibility
Compatible withCyberPower OL8KRTHD, OL10KRTHD

Questions about this item

Should I buy the 8-battery cartridge or look for a smaller pack?

The cartridge contains eight 12 V 9 Ah sealed lead-acid cells and is designed as a single replacement unit for the OL8KRTHD and OL10KRTHD UPS models; individual batteries are not sold separately for these units.

What runtime will the 9 Ah rating actually give my OL8KRTHD?

The 9 Ah capacity per cell restores the original battery string in compatible UPS units, so runtime will match the factory specification for the OL8KRTHD or OL10KRTHD under the same load conditions.

Does the cartridge use a standard connector or a proprietary interface?

The battery cartridge is built for direct, tool-free installation in the CyberPower OL8KRTHD and OL10KRTHD UPS systems and uses the manufacturer’s dedicated battery bay connector.

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