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Rectangular black sealed lead-acid battery with two top terminals

BatteryJack inc.

BatteryJack inc. UB1230 RBC35 12V 3.3AH UPS replacement battery

SKU CH-DTHS-JWANC

12 V 3.3 Ah AGM battery cartridge replaces RBC35 in APC Back-UPS ES 325/350 units

  • Direct drop-in for APC Back-UPS ES models
  • AGM chemistry delivers 4–7 year service life
  • Maintenance-free sealed design needs no watering
  • Compact 5.28 × 2.64 × 2.4 inch footprint fits tight bays
  • 100 % OEM-compatible replacement for RBC35 cartridge

Direct APC Back-UPS ES replacement

The UB1230 RBC35 cartridge fits APC Back-UPS ES models BE350C and BE350R as a 100 percent OEM replacement. It uses a 12 V 3.3 Ah AGM cell that is maintenance-free and ready to install without configuration. Compatible units also include BE325-FR, BE350, BE350ES, BE350G and BE350U models.

Sealed AGM design runs without ventilation

The absorbed glass mat construction eliminates electrolyte spillage and allows operation in any orientation. Expected service life spans four to seven years under normal float conditions. No watering or periodic checks are required once the cartridge is seated in the UPS chassis.

Terminal spacing matches original cartridge

The 1.6 inch distance between terminals aligns with the factory connector so no adapter cables are needed. The package includes only the battery cartridge; mounting hardware and management software remain those supplied with the original UPS.

Highlights

  • Direct drop-in for APC Back-UPS ES models
  • AGM chemistry delivers 4–7 year service life
  • Maintenance-free sealed design needs no watering
  • Compact 5.28 × 2.64 × 2.4 inch footprint fits tight bays
  • 100 % OEM-compatible replacement for RBC35 cartridge

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the UB1230 RBC35 cartridge in my APC Back-UPS ES BE350C, and what step do people often miss?

Slide the cartridge into the battery compartment until the connectors seat firmly on the 1.6 inch spaced terminals; the step most people miss is removing the front cover before pulling the old cartridge out.

What maintenance or replacement will the UB1230 RBC35 need during its service life?

The AGM cell is maintenance-free; plan to replace the cartridge once the expected 4-7 year battery life is reached.

What limit appears first when the UB1230 RBC35 runs under sustained load in a UPS?

The 3.3 AH capacity determines runtime; once that stored energy is depleted the UPS will shut down.

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