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Rectangular sealed lead-acid battery, black plastic case, two terminals on top

BatteryJack inc.

BatteryJack inc. Elk ELK-1280 12V 9.0Ah UPS Replacement Battery

SKU CH-RJEA-YY2HZ

A 12 V sealed lead-acid battery with 9.0 Ah capacity, AGM technology, and T1/T2 terminals that fits numerous APC Back-UPS and Smart-UPS models

  • 0 Ah capacity extends runtime over standard 7.5 Ah packs
  • Advanced AGM chemistry delivers 4–7 year expected service life
  • Sealed maintenance-free design requires no fluid checks or refills
  • 100 % OEM-compatible replacement for over 100 APC UPS models
  • 12 V 9.0 Ah in standard 5.94 × 2.56 × 3.66 in case fits existing trays

Direct UPS Upgrade

This 12V 9.0Ah sealed lead-acid battery replaces the Elk ELK-1280 in compatible APC Back-UPS and Smart-UPS units. Advanced AGM construction raises capacity above the original 7Ah or 7.5Ah cells while keeping the same footprint. It arrives ready to install with no acid handling required.

Drop-In Compatibility

The pack fits models including the Back-UPS 250B, 300, 350, 400, 500 and Pro 280 through Pro 500 series plus AP330, AP360 and AP600 units. Terminal type T1/T2 matches the original connectors so no adapter cables are needed. Physical dimensions of 5.94 by 2.56 by 3.66 inches match the factory battery tray.

Maintenance-Free Operation

AGM electrolyte is absorbed in glass mat separators eliminating watering or venting tasks during the 4 to 7 year design life. Sealed construction prevents leakage in any orientation and keeps gas recombination internal. The unit delivers its rated capacity without adding audible fan load or changing the UPS power draw profile.

Highlights

  • 0 Ah capacity extends runtime over standard 7.5 Ah packs
  • Advanced AGM chemistry delivers 4–7 year expected service life
  • Sealed maintenance-free design requires no fluid checks or refills
  • 100 % OEM-compatible replacement for over 100 APC UPS models
  • 12 V 9.0 Ah in standard 5.94 × 2.56 × 3.66 in case fits existing trays

Specifications

No published specifications for this item yet.

Questions about this item

How long will the 9.0Ah capacity last before the battery reaches its expected end of life?

The manufacturer rates the expected battery life at 4 to 7 years depending on usage conditions and ambient temperature.

Does the sealed AGM design produce any audible noise or measurable heat during continuous float charging?

The sealed AGM construction is maintenance-free and operates silently with negligible heat output during normal float-charge operation.

Which terminal type must my UPS have to accept the T1/T2 terminals on this battery?

Your UPS must use either T1 faston tabs or T2 blade terminals; the battery includes both styles for direct drop-in fit.

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