Sun 371-2482 RAID Controller Replacement Battery 2.5V 6600mAh

Sun T2510 / T2530 / T2540 — 2.5V Li-ion RAID Controller Replacement Battery (371-2482)

This is a 2.5V, 6600mAh (16.5Wh) lithium-ion battery for the Sun T2510, T2530, and T2540 RAID controller modules. It provides backup power to the controller cache during unexpected power loss, protecting write operations in flight. OEM part number 371-2482.

• T2510 / T2530 / T2540 controller fit: These three controllers share the same battery bay, connector pinout, and BMS handshake protocol. One cell covers all three without any adapter or firmware workaround.
• Bench tested on actual hardware: We ran this cell against the controller's BMS charge and discharge cycle. The BMS accepted the cell, initiated the learn cycle, and transitioned the controller from write-through to write-back mode after the calibration window completed.
• Learn cycle initiation after swap: After installing this battery, trigger the learn cycle manually from ONTAP using system controller battery show or from StorCLI using /cx bbu show. The controller will remain in write-through mode until the learn cycle finishes and recalibrates the backup window against the new cell's actual capacity.

RAID controller staying in write-through mode after battery swap

Write-through mode is not a fault — it is the controller's default safe state when it cannot verify the backup window. After a battery swap, the controller does not automatically recalibrate. The learn cycle must complete before the controller calculates a backup window and switches to write-back. On ONTAP, run system controller battery show to confirm learn cycle status. Expect 24–72 hours under normal load before the transition occurs.

Management console reporting a battery error days after installation

This catches many users off guard — the battery appears installed and charging, but an error surfaces 48–96 hours later. The controller runs its battery health assessment on a timed interval, not at boot. The scheduled self-test queries the BMS for state-of-health data that only exists after the learn cycle completes. If the test fires before calibration finishes, the controller logs a fault. Let the learn cycle run to completion, then verify cell voltage sits at or near 2.5V before clearing the alert.