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Two square 12 V 5 A sealed lead-acid batteries in a replacement kit

RefurbUPS

RefurbUPS ON400J-SN 12V 5A UPS replacement battery

SKU CH-Z4CE-DTYZ3

Two 12 V 5 A sealed lead-acid batteries replace the UPS cartridge for reliable backup power

  • TypeKit/Package
  • Weight5
  • Compatible kit replaces two 12 V 5 A batteries
  • Ready to install with included instructions
  • Factory-fresh cells deliver reliable backup power
  • Sealed lead-acid design needs no maintenance
  • Direct fit for ONeAc ON400J-SN UPS units

What this kit replaces

This kit provides two 12V 5A sealed lead-acid batteries designed as a direct replacement for compatible UPS units. It is intended for administrators maintaining backup power on servers or network equipment where the original cells have reached end of life.

Behaviour under sustained load

The cells are rated for high-rate discharge, meaning they can deliver the current required during a power outage without excessive voltage sag. They are built for standby service rather than deep cycling, so runtime will shorten if the UPS is discharged frequently.

Limits of the 12V interface

Each battery supplies 12 volts nominal; the pair must be wired in series by the UPS to reach the voltage the inverter expects. Capacity is fixed at the rated ampere-hours, so the unit cannot be expanded by adding further cells. The chemistry does not support rapid recharge after a full discharge.

Highlights

  • Compatible kit replaces two 12 V 5 A batteries
  • Ready to install with included instructions
  • Factory-fresh cells deliver reliable backup power
  • Sealed lead-acid design needs no maintenance
  • Direct fit for ONeAc ON400J-SN UPS units

Specifications

BrandOneAC
SeriesOneAC Batteries
TypeKit/Package
Weight5

Questions about this item

Does the 12V 5A kit generate noticeable heat or noise during continuous UPS operation?

The sealed lead-acid cells run silently and produce only minimal warmth under normal load.

What existing UPS hardware is required before installing these two 12V 5A cartridges?

A compatible UPS chassis designed for dual 12 V 5 Ah battery strings and the original mounting brackets.

Will the ON400J-SN kit work reliably alongside the original batteries already in my older UPS unit?

Mixing fresh 12 V 5 Ah cells with aged packs is not recommended; replace the full set for balanced performance.

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