NetApp 271-00046 AFF A300 RAID Controller Replacement Battery 7.4V

Netapp AFF A300 / FAS9000 Series — 7.4V Li-ion Replacement Battery (271-00046)

This 7.4V 3600mAh Li-ion cell replaces OEM part 271-00046 in the Netapp AFF A300, AFF A700, FAS8200, and FAS9000 controller modules. It provides backup power to the RAID controller, giving the system enough energy to flush cache to stable storage during an unplanned power loss. Voltage and capacity match the original cell — 7.4V, 3600mAh (26.64Wh).

• AFF A300 / FAS9000 controller compatibility: These four platforms share the same controller module form factor and backup power rail. The 271-00046 cell connects through the same BMS interface across the AFF A700, FAS8200, and FAS9000 — one cell serves all four without modification.
• Bench tested on actual hardware: We ran the 271-00046 replacement through charge and BMS handshake verification on a controller module. The BMS accepted the cell, completed initial charge, and reported battery status correctly via ONTAP before the learn cycle was initiated.
• Learn cycle initiation after swap: After installing this cell, the controller will remain in write-through mode until it completes a full battery learn cycle. Run system controller battery show in ONTAP to monitor cycle progress. Write-back mode will not re-engage until the controller recalibrates its backup window estimate against the new cell — this can take 24 to 72 hours under normal load.

RAID controller staying in write-through mode after battery swap

Replacing the battery does not automatically trigger write-back re-engagement. The controller requires a completed learn cycle before it trusts the new cell enough to switch modes. Until that cycle finishes, all writes bypass the cache buffer and go directly to disk — slower, but safe. Run system controller battery show in ONTAP to confirm the learn cycle has started and to check its current status.

ONTAP reporting a battery error days after installation

ONTAP runs its scheduled battery health assessment on a timed interval, not at the moment of installation or reboot. If the assessment fires before the learn cycle completes, it can flag the battery as degraded even on a fully charged new cell. This is expected behaviour — it is not a sign of a faulty cell. Re-check battery status after 72 hours using system controller battery show; a healthy cell will clear the fault once the assessment reruns post-cycle.