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Rectangular sealed lead-acid battery cartridge with two top terminals, dark grey plastic case

BatteryJack inc.

BatteryJack inc. RBC35 UPS Replacement Battery 12V 3.3AH for APC Back-UPS ES BE350 Series

SKU CH-YS2M-49A3F

12V 3.3AH AGM replacement cartridge fits APC Back-UPS ES BE350 series and compatible CyberPower models

  • Reliable backup power with 12V 3.3AH AGM capacity
  • Maintenance-free design eliminates routine upkeep
  • 100% OEM replacement ensures direct compatibility with APC BE350 series
  • Compact 5.28 x 2.64 x 2.4 inch form factor fits existing battery compartments
  • Expected 4-7 year service life provides long-term protection

Direct replacement for APC Back-UPS ES BE350 series

This 12V 3.3AH sealed lead-acid battery uses AGM technology and fits the RBC35 cartridge form factor. It is a 100% OEM-compatible replacement for the original battery in APC Back-UPS ES BE350, BE350G, BE350U and BE350C units. The maintenance-free design requires no user servicing during its service life.

AGM chemistry limits deep-cycle use

The absorbed glass mat construction provides stable voltage for short backup intervals but is not designed for repeated deep discharges or continuous high-load operation. Expected battery life ranges from four to seven years under typical standby conditions. Terminal spacing is fixed at 1.6 inches, so cable reach must match the original layout.

Capacity of 3.3AH at 12V determines runtime

This single figure dictates how long connected equipment stays powered during an outage. Buyers who need longer runtime for the same UPS cannot use this cartridge; a higher-capacity pack would require a different physical size and terminal arrangement not supported by the BE350 chassis.

Highlights

  • Reliable backup power with 12V 3.3AH AGM capacity
  • Maintenance-free design eliminates routine upkeep
  • 100% OEM replacement ensures direct compatibility with APC BE350 series
  • Compact 5.28 x 2.64 x 2.4 inch form factor fits existing battery compartments
  • Expected 4-7 year service life provides long-term protection

Specifications

No published specifications for this item yet.

Questions about this item

Should I choose the RBC35 or the RBC47 cartridge for my APC Back-UPS ES BE350?

The RBC35 is the correct cartridge for the APC Back-UPS ES BE350 series. The RBC47 is listed as a separate compatible model but is not the designated replacement for this UPS line.

What runtime can I expect from the 12V 3.3AH battery in my BE350 UPS?

The 3.3AH capacity at 12V provides the standard runtime designed for the BE350 series. Actual backup time depends on the connected load; lower loads will yield longer runtime.

What terminal spacing does the RBC35 use and will it fit my BE350?

The battery terminals are spaced 1.6 inches apart, matching the original APC cartridge. It fits the BE350, BE350C, BE350ES, BE350G and BE350U models directly.

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