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Sealed 12 V lead-acid battery kit in plastic housing

RefurbUPS

RefurbUPS ONeAc ONM300J-SI 12V UPS replacement battery kit

SKU CH-8D1C-KJAJK

A compatible replacement kit containing a 12 V 7 Ah battery cartridge for UPS units

  • TypeKit/Package
  • Weight6
  • Compatible replacement kit keeps UPS running
  • Two high-rate 12 V SLA batteries deliver reliable backup
  • Factory-fresh cells ensure immediate performance
  • Step-by-step instructions simplify installation
  • 300 J series fit confirmed by supplier

Compatible UPS battery kit

The RefurbUPS ONeAc ONM300J-SI kit provides a direct replacement for compatible UPS units. It contains two factory-fresh 12 Volt sealed lead-acid batteries rated for high-rate discharge. The package includes comprehensive installation instructions so the swap can be completed without specialist tools. This restores backup power to the UPS with minimal downtime.

Sustained discharge reliability

Each 12V7A battery is built for high-rate discharge so the UPS can deliver its rated load during an outage. The sealed lead-acid chemistry maintains stable voltage through the discharge curve rather than collapsing under heavy draw. Factory-fresh cells reduce the risk of early capacity loss that affects shelf-aged stock. The kit is designed to meet the original runtime specifications of the supported UPS.

Upgrade from depleted cells

This kit replaces worn or failed internal batteries that no longer hold charge or that trigger a replacement alert. The jump is worth it when the UPS self-test fails or when runtime has dropped below the level required for safe shutdown. It is not for buyers who need a higher-capacity pack or a different voltage configuration than the original design.

Highlights

  • Compatible replacement kit keeps UPS running
  • Two high-rate 12 V SLA batteries deliver reliable backup
  • Factory-fresh cells ensure immediate performance
  • Step-by-step instructions simplify installation
  • 300 J series fit confirmed by supplier

Specifications

BrandOneAC
SeriesOneAC Batteries
TypeKit/Package
Weight6

Questions about this item

How much heat does the 12V battery kit produce during continuous daily use?

The sealed lead-acid cells generate only modest warmth under normal float charge; no active cooling is required.

What existing UPS hardware is needed to install the ONM300J-SI kit?

A compatible OneAC UPS that accepts two 12V high-rate discharge SLA cartridges and the supplied installation instructions.

Will the 300-series kit work alongside the original battery modules already in my OneAC UPS?

Yes, it is built as a direct compatible replacement so the new cartridges operate in parallel with the UPS's existing charging circuitry.

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