Battery for Dell PERC 5I/6I H700 RAID controller, model NU209-RFB, backup capacitor module

Replacement battery module NU209-RFB for Dell PERC 5I/6I and H700 RAID controllers. This backup capacitor module supplies temporary power to the RAID controller cache in the event of a power interruption, helping to preserve write-back cached data until main power is restored. The module is designed for use in server environments and is compatible with specified Dell PERC controllers. It is intended as a maintenance or replacement part to maintain RAID performance and protect data integrity in systems that rely on controller cache.

Advantages

The NU209-RFB backup capacitor module provides targeted protection for cached write data without requiring a full battery replacement on the controller board. It is compact and designed to match the electrical and mechanical interfaces of Dell PERC 5I/6I and H700 controllers, enabling straightforward replacement. By preserving cache contents during brief outages, the module reduces the risk of write-back data loss and helps avoid RAID reconstruction due to corrupted cache states. The unit is suitable for rack and tower servers where maintaining RAID controller cache integrity is important.

Suitable for

• Service or replacement on Dell PERC 5I and 6I RAID controllers
• Replacement on Dell PERC H700 RAID controllers
• Server maintenance in datacenters and enterprise IT environments
• Environments requiring protection of write-back cache during short power interruptions

Key specifications

• Manufacturer brand: Dell
• Model / MPN: NU209-RFB
• Compatibility: Dell PERC 5I, PERC 6I, PERC H700 RAID controllers
• Function: Backup capacitor module (cache power protection)
• Category: Batteries / backup capacitor modules for RAID controllers

How to use

Power down the server and follow ESD precautions before servicing the RAID controller. Remove the server cover to access the RAID card slot and locate the existing backup module on the controller if present. Carefully disconnect any connector securing the old module and remove it according to the controller manufacturer’s service instructions. Install the NU209-RFB module by aligning it with the connector and seating it firmly. Reassemble the server, reconnect power, and verify controller status using the server management utility or RAID BIOS to confirm the module is recognized and functioning.

Usage recommendations

Use this module only in compatible Dell PERC 5I/6I and H700 controllers. Replace the module following Dell service documentation and standard ESD-safe procedures. Periodically verify RAID controller cache health and firmware compatibility after installation. For extended outages or where battery-backed write cache is required for longer durations, consider a full battery backup unit (BBU) or alternative UPS solutions as appropriate for your environment.