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Sealed lead-acid UPS battery kit, rectangular block with terminal posts

Monoprice Inc.

Monoprice Inc. CyberPower RB1290X3L 9000 mAh 12 V UPS Replacement Battery

SKU CH-MFQN-68G5B

Sealed lead-acid 12 V battery kit delivers 9000 mAh for UPS backup power

  • Product typeConsumer Electronics
  • 9000 mAh capacity keeps UPS running longer
  • 12 V sealed lead-acid chemistry is leak proof and maintenance free
  • CyberPower RB1290X3L kit fits 1.5 kVA units with 36 V 60 A battery cartridges
  • 18 month warranty period backs the replacement battery

CyberPower RB1290X3L 12 V UPS Replacement Battery

The CyberPower RB1290X3L is a sealed lead-acid battery kit rated at 9000 mAh and 12 V DC. It is designed as a direct replacement cartridge for compatible UPS units, offering leak-proof, maintenance-free operation. Buyers restoring backup runtime in office or home-office power protection systems will find this unit matches the original specifications. It is not suited for applications requiring higher voltage packs or larger ampere-hour capacities beyond the stated rating.

9000 mAh capacity and 36 V 60 A system context

The kit delivers 9000 mAh at 12 V per module, supporting UPS configurations such as the 1.5 kVA, 36 V, 60 A battery string referenced in the supplier data. Runtime scales with the number of modules installed in the UPS; a single cartridge provides limited headroom for extended outages. The sealed construction eliminates electrolyte maintenance but offers no user-serviceable cells. Buyers needing longer autonomy must add further cartridges as the UPS chassis permits.

How it compares

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

Price $128.99
Pricier than about 80% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand nameCYBERPOWER SYSTEMS USA
Product typeConsumer Electronics

Questions about this item

Will the 12 V DC output of this CyberPower RB1290X3L kit match the voltage requirement of my existing UPS unit?

Yes, the kit supplies 12 V DC, which is the standard voltage for compatible UPS battery slots.

How can I verify the 9000 mAh capacity is delivering the expected runtime after installation?

Run a self-test from the UPS front panel or management software; the reported backup minutes should align with the 9000 mAh rating under your normal load.

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