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Rectangular black sealed lead-acid battery with two top terminals

BatteryJack inc.

BatteryJack inc. RBC35 12V 3.3Ah UPS Replacement Battery

SKU CH-NB89-6VC9P

12 V 3.3 Ah AGM replacement battery fits APC RBC35 and compatible UPS units

  • Maintenance-free AGM design eliminates electrolyte checks
  • 3 Ah capacity powers UPS through extended outages
  • Exact 5.28 x 2.64 x 2.4 in dimensions fit APC RBC35 slots
  • 6 in terminal spacing matches original wiring harness
  • Compatible with APC BE325 BE350 and CyberPower CPS325SL models

Direct replacement for APC RBC35

The PowerStar 12V 3.3Ah SLA/AGM battery is a brand-new, maintenance-free unit built with advanced AGM technology for stable quality and high reliability. It serves as a 100% OEM replacement for the APC RBC35 cartridge and compatible CyberPower models. Expected service life ranges from four to seven years.

Fits BE325, BE350 and CyberPower 325SL units

The compact design measures 5.28 by 2.64 by 2.4 inches with terminals spaced 1.6 inches apart, allowing it to slide into the listed APC Back-UPS ES and CyberPower CPS series units without modification. It frees the UPS from capacity loss caused by aged cells and restores runtime for connected loads.

Sustained backup power for critical systems

Under continuous discharge the AGM chemistry delivers steady voltage for emergency lighting, fire alarm panels, security systems and telecommunication gear. The maintenance-free construction avoids electrolyte checks while supporting long-term float service in auto-control and DC power supply applications.

Highlights

  • Maintenance-free AGM design eliminates electrolyte checks
  • 3 Ah capacity powers UPS through extended outages
  • Exact 5.28 x 2.64 x 2.4 in dimensions fit APC RBC35 slots
  • 6 in terminal spacing matches original wiring harness
  • Compatible with APC BE325 BE350 and CyberPower CPS325SL models

Specifications

No published specifications for this item yet.

Questions about this item

How long will the RBC35 battery last under continuous load before it needs replacing?

The manufacturer rates the expected service life at 4 to 7 years depending on operating conditions and discharge depth.

Does the 12V 3.3Ah AGM cell generate noticeable heat or noise during all-day UPS operation?

AGM chemistry is sealed and maintenance-free with no moving parts so it runs silently and produces minimal heat under normal float charge.

Which APC UPS models accept the RBC35 cartridge without modification?

The RBC35 fits APC BACK-UPS ES BE325-FR BE350 BE350C BE350ES BE350G BE350U and ES 325 units directly.

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