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Rectangular black sealed battery pack with two top terminals

BatteryJack inc.

BatteryJack inc. 12V 3.4Ah UPS Replacement Battery RBC35

SKU CH-Q5S2-HG1TQ

12 V 3.4 Ah AGM replacement cartridge fits APC RBC35 and CyberPower UPS units

  • Maintenance-free AGM design eliminates electrolyte checks
  • 4 Ah capacity powers compatible UPS units
  • Fits APC RBC35 and CyberPower 325SL cartridges
  • Compact 5.28 × 2.64 × 2.4 in footprint
  • 6 in terminal spacing ensures direct drop-in fit

Direct-fit APC replacement

This 12 V 3.4 Ah sealed AGM cartridge replaces the APC RBC35 and RBC47 packs used in Back-UPS ES models such as the BE325, BE350 and BE350G. The unit measures 5.28 by 2.64 by 2.4 inches with a 1.6 inch terminal spacing so it drops straight into the existing battery compartment. Maintenance-free operation and a four-to-seven-year design life keep the UPS ready for immediate failover. It is sold new with a three-year warranty on the backup device.

Suits small-office UPS owners

Buyers who need a drop-in swap for a depleted RBC35 cartridge in a compatible APC or CyberPower unit will find the voltage, capacity and terminal layout match the original specification. The pack is not intended for larger UPS chassis that require higher amp-hour ratings or different physical dimensions. Installers looking for lithium chemistry or hot-swappable modular frames should look elsewhere.

Capacity for short-runtime loads

At 3.4 Ah the battery comfortably powers a typical desktop, router and modem long enough for a controlled shutdown during brief outages. Extended runtime beyond the factory-rated window will exhaust the reserve, so environments that demand half-hour or longer autonomy need a higher-capacity UPS platform rather than a single cartridge swap.

How it compares

Measured against everything we stock in UPS Replacement Batteries, at today’s prices. Recalculated every night.

Price $17.99
Cheaper than about 78% of the 3,915 comparable items (median $39.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Which UPS models does the 12 V 3.4 Ah RBC35 cartridge fit?

The cartridge replaces APC RBC35 and RBC47 units and fits Back-UPS ES models including BE325-FR, BE350, BE350C, BE350ES, BE350G, BE350U and ES 325.

Will the 5.28 × 2.64 × 2.4 in case with 1.6 in terminal spacing fit my existing battery tray?

Those are the exact outside dimensions and terminal centres; compare them with your current battery to confirm physical fit before ordering.

How can I verify the new battery is working once installed?

Run the UPS self-test from the front panel or management software; a passing result confirms the 12 V 3.3 Ah AGM pack is delivering rated capacity.

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