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Rectangular black sealed lead-acid battery with two top terminals

BatteryJack inc.

BatteryJack inc. RBC35 UPS Replacement Battery 12V 3.3AH APC BE350U

SKU CH-VR9V-DK4FB

A 12 V 3.3 Ah AGM replacement battery for APC BE350U and compatible UPS units

  • Direct OEM fit for APC BE350U units
  • Maintenance-free AGM chemistry simplifies upkeep
  • Compact 5.28 × 2.64 × 2.4 inch footprint
  • 12 V 3.3 Ah capacity supports backup runtime
  • Three-year warranty backs long-term reliability

Direct APC BE350U Replacement

This 12V 3.3AH sealed lead-acid battery replaces the APC RBC35 cartridge in Back-UPS ES models including the BE350U, BE350G and BE325-FR. It uses AGM chemistry for maintenance-free operation and fits the original battery compartment without modification. The unit arrives new and ready to install in compatible UPS systems.

Capacity Matches Original 3.3AH Rating

Rated at 3.3AH, the battery delivers the same amp-hour capacity as the factory RBC35 cell for typical desktop and networking loads. Expected service life spans four to seven years under normal float conditions. Runtime will decrease as the battery ages or when connected equipment draws heavier continuous current.

Swaps Into Listed CyberPower and APC Units

The terminal spacing of 1.6 inches matches the RBC35, RBC47 and several CyberPower CPS and SL series models listed in the compatibility data. It does not suit UPS units that require a different voltage, capacity or terminal layout. Buyers needing higher capacity or alternative form factors should verify their UPS specification before ordering.

Highlights

  • Direct OEM fit for APC BE350U units
  • Maintenance-free AGM chemistry simplifies upkeep
  • Compact 5.28 × 2.64 × 2.4 inch footprint
  • 12 V 3.3 Ah capacity supports backup runtime
  • Three-year warranty backs long-term reliability

Specifications

No published specifications for this item yet.

Questions about this item

Will the 1.6 inch terminal spacing on this RBC35 battery match the connectors inside my older BE350U unit?

Yes, the 1.6 inch distance between terminals matches the original RBC35 specification used in the BE350U, so the existing wiring harness will connect without modification.

How can I confirm the 12V 3.3AH battery is delivering full runtime after I install it?

After charging for the recommended period, run a self-test from the UPS front panel or management software; a passed test and the expected backup minutes for your load indicate the battery is performing to its 3.3AH rating.

Does the box include mounting brackets or cables, or do I reuse the hardware from the old RBC35 cartridge?

The replacement is a bare 12V 3.3AH SLA/AGM cell measuring 5.28 x 2.64 x 2.4 inches; you reuse the existing cartridge tray, brackets and wiring from the original RBC35 pack.

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