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Black rectangular sealed lead-acid battery pack, three 12V 9Ah cells, 5.94 x 4.13 x 7.80 inches, 18 LB

GreenTechLLC

GreenTechLLC RB1290X3B 36V 9Ah UPS battery for CyberPower M1100XL

SKU CH-NGAK-Z6HBR

Replacement 36 V 9 Ah SLA battery pack for CyberPower M1100XL UPS units, tested and ready to install

  • ColorBlack
  • TypeBattery
  • CompatibilityCYBERPOWER UPS M1100XL, RB1290X3B
  • Battery Voltage36 V
  • Battery Capacity9 AH
  • Dimension5.94" x 4.13" x 7.80"
  • Ready to install after factory testing
  • 36 V 9 Ah capacity powers CyberPower M1100XL
  • Three 12 V 9 Ah cells deliver 36 VDC
  • Compact 5.94 x 4.13 x 7.80 inch form fits UPS bay
  • 18 lb sealed lead-acid pack replaces RB1290X3B

Compatible replacement for CyberPower M1100XL

This GreenTech RB1290X3B battery pack supplies 36 VDC at 9 Ah for the CyberPower M1100XL UPS. It arrives tested, charged and ready to install. The unit is built as three 12 V modules wired in series. Buyers who need a different voltage or capacity should look elsewhere.

Three 12 V modules in series

The pack contains three sealed lead-acid cells, each rated at 12 V and 9 Ah, delivering the required 36 V total. No cables, mounting brackets or management software are included in the box. Installers must reuse the original harness and hardware from the UPS.

Check UPS model and bay dimensions

Confirm the UPS is a CyberPower M1100XL and that the battery compartment accepts the 5.94" x 4.13" x 7.80" form factor. The pack weighs 18 LB, so ensure the mounting tray can support that mass. Verify the existing connector polarity before wiring.

Highlights

  • Ready to install after factory testing
  • 36 V 9 Ah capacity powers CyberPower M1100XL
  • Three 12 V 9 Ah cells deliver 36 VDC
  • Compact 5.94 x 4.13 x 7.80 inch form fits UPS bay
  • 18 lb sealed lead-acid pack replaces RB1290X3B

Specifications

BrandGreenTech
ModelRB1290X3B
Part NumberGTS-RB1290X3B-36V
ColorBlack
TypeBattery
CompatibilityCYBERPOWER UPS M1100XL, RB1290X3B
Battery Voltage36 V
Battery Capacity9 AH
Dimension5.94" x 4.13" x 7.80"
Weight18 LB

Questions about this item

When will the three 12 V 9 Ah cells in the RB1290X3B need replacement?

Valve-regulated lead-acid cells typically last three to five years; plan replacement when runtime drops below 80 % of the original 9 Ah capacity.

What limits the M1100XL battery pack during a long discharge?

The 9 Ah rating at 36 V sets the total energy available; voltage will fall steadily until the UPS reaches its low-voltage cutoff.

How much heat does the 18 lb RB1290X3B produce while the UPS runs all day?

SLA chemistry generates minimal heat during float charging; the sealed case stays near ambient temperature under normal load.

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