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Rectangular black sealed battery, two terminals on top, 5.28 by 2.64 by 2.4 inches

BatteryJack inc.

BatteryJack inc. RBC35 ups replacement battery 12V 3.3AH

SKU CH-C8WV-HMY91

12 V 3.3 Ah AGM cartridge fits APC Back-UPS ES 325, 350 and CyberPower 325SL, 320SL, 300SL models

  • AGM technology delivers maintenance-free operation
  • 12V 3.3AH capacity provides reliable backup power
  • Direct fit for APC RBC35 and CyberPower 325SL cartridges
  • Compact 5.28 x 2.64 x 2.4 inch design fits tight UPS bays
  • Expected 4-7 year service life reduces replacement frequency

Direct UPS replacement

The BatteryJack inc. RBC35 is a 12V 3.3AH sealed lead-acid battery built with AGM technology. It serves as a 100% OEM replacement cartridge for APC Back-UPS ES models including the BE350C and BE350R. The unit arrives new and maintenance-free for immediate installation.

Sealed maintenance-free design

AGM construction eliminates the need for water top-ups and allows operation in any orientation without leakage. The compact case measures 5.28 by 2.64 by 2.4 inches with terminals spaced 1.6 inches apart. Expected service life spans four to seven years under normal float conditions.

Fits APC RBC35 cartridge slot

Compatibility covers APC Back-UPS ES BE325-FR, BE350, BE350C, BE350ES, BE350G, BE350U, ES 325, RBC35 and RBC47 cartridges. It also matches CyberPower 325SL, CPS300SL, CPS320SL, CPS325SL and Conext CNB325 units. Buyers with UPS models outside this list cannot use this battery.

Highlights

  • AGM technology delivers maintenance-free operation
  • 12V 3.3AH capacity provides reliable backup power
  • Direct fit for APC RBC35 and CyberPower 325SL cartridges
  • Compact 5.28 x 2.64 x 2.4 inch design fits tight UPS bays
  • Expected 4-7 year service life reduces replacement frequency

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the RBC35 cartridge in my Back-UPS ES BE350C, and which step is often missed?

Slide the cartridge into the battery compartment until the connectors seat firmly on the 1.6 inch spaced terminals; the step most people skip is pressing hard enough to fully engage both terminals.

What maintenance or replacement will this 12V 3.3AH AGM battery need during its 4-7 year expected life?

The battery is maintenance-free, so no topping up is required; plan to replace the whole cartridge once runtime drops noticeably, typically after 4 to 7 years of service.

What limit appears first when the UPS runs on this battery during a long outage?

The 3.3 ampere-hour capacity sets the runtime ceiling; once that stored energy is depleted the UPS will shut down regardless of load.

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