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Small rectangular black battery with two terminals on top

BatteryJack inc.

BatteryJack inc. 12V 3.4Ah UPS Replacement Battery for APC BE350C RBC35

SKU CH-W0X2-453FY

12 V 3.4 Ah AGM battery replaces APC BE350C and compatible UPS units with maintenance-free operation

  • 12 V 3.4 Ah capacity keeps your UPS running longer
  • Advanced AGM technology delivers maintenance-free, spill-proof operation
  • Direct 100 % OEM replacement for APC BE350C and RBC35 cartridges
  • Compact 5.28 × 2.64 × 2.4 in design fits tight battery bays
  • Expected 4-7 year service life reduces replacement frequency

12 V 3.4 Ah APC UPS Battery

This 12 V 3.4 Ah sealed lead-acid battery replaces the original RBC35 cartridge in APC Back-UPS ES models such as the BE350C, BE350G and BE350U. It uses AGM chemistry for maintenance-free operation and a rated service life of four to seven years. Buyers who need a higher capacity or a different voltage will not be served by this unit.

Slide-in cartridge swap

The battery ships fully charged and fits the existing compartment without tools; terminals are spaced 1.6 inches apart to match the OEM connector. The only common issue is forgetting to disconnect the UPS from mains power before opening the battery door, which can trip the internal breaker. No soldering or firmware updates are required.

Steady backup under load

Under continuous discharge the AGM cells deliver stable voltage until the UPS initiates its low-battery shutdown, avoiding the sharp voltage sag seen in short-pulse tests. The compact 5.28 by 2.64 by 2.4 inch case dissipates heat passively, so runtime remains consistent during extended outages. Periodic self-tests keep the pack ready for the next event.

Highlights

  • 12 V 3.4 Ah capacity keeps your UPS running longer
  • Advanced AGM technology delivers maintenance-free, spill-proof operation
  • Direct 100 % OEM replacement for APC BE350C and RBC35 cartridges
  • Compact 5.28 × 2.64 × 2.4 in design fits tight battery 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 confirm the 12V 3.4Ah battery is working correctly after installing it in my APC BE350C?

The UPS should power on normally, show a full charge indicator and pass a self-test without reporting a battery fault.

What comes in the box and is any extra hardware required for the RBC35 replacement?

The box contains the 12V 3.3Ah AGM battery with F2 terminals spaced 1.6 inches apart; no additional cables or brackets are needed for the listed APC and CyberPower models.

Should I choose the 3.4Ah version or the 3.3Ah version for my BE350C UPS?

Both ratings refer to the same PowerStar AGM cell; the 3.3Ah unit is the direct OEM replacement for the RBC35 cartridge used in the BE350C.

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