Nexergy NetApp N3600 RAID Battery 271-00011 7.4V 5200mAh

Nexergy Netapp N3600 — 7.4V Li-ion Replacement Battery (271-00011)

This 7.4V 5200mAh Li-ion battery replaces the OEM cache backup cell in the NetApp N3600 RAID controller. It provides backup power to the controller's write cache during a power loss event, giving the system time to flush cached data to disk. Matches the OEM part number 271-00011 directly.

• NetApp N3600 controller compatibility: The N3600 controller validates cell voltage and BMS handshake on every boot. This replacement cell operates on the same 7.4V nominal rail and presents the correct BMS communication profile, so the controller recognises it without firmware changes or manual overrides.
• Bench tested on actual hardware: We cycled this cell under simulated cache-flush load and monitored the BMS cutoff behaviour. The cell held voltage within the controller's expected window across full charge and discharge cycles, and the BMS flagged no fault conditions during testing.
• Post-swap learn cycle initiation: After installing this battery, run a full learn cycle from the management interface — in ONTAP use system controller battery show to confirm status. The N3600 controller stays in write-through mode until the learn cycle completes and recalibrates the backup window estimate against the new cell's actual capacity.

RAID controller staying in write-through mode after battery swap

The N3600 controller does not automatically switch back to write-back mode after a battery replacement. It waits for the learn cycle to finish before it trusts the new cell's backup window estimate. Until that cycle completes, all writes bypass the cache and go directly to disk, which reduces storage throughput. Trigger the learn cycle from ONTAP or your management console and allow 24–72 hours for it to finish under normal system load.

ONTAP still showing a battery error two days after installation

The battery health assessment in ONTAP runs on a timed interval — it does not re-evaluate the cell at the moment of installation. If the scheduled assessment hasn't run yet, the console continues to display the previous fault state. This is not a sign the new cell is defective. Check the assessment timestamp with system controller battery show and confirm the next scheduled assessment has executed before drawing any conclusions about cell health.