{"product_id":"ibm-n6210-replacement-battery-72v-6800mah-li-ion","title":"IBM N6210 RAID Controller Replacement Battery 7.2V 6800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM N6210 — 7.2V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.2V 6800mAh (48.96Wh) Li-ion battery replaces the backup power cell in the IBM N6210 RAID controller module. It maintains cache protection during unexpected power loss, giving the controller enough power to flush write-pending data to storage before shutdown. Without a functional battery, the controller falls back to write-through mode and write performance drops significantly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eN6210 controller fit:\u003c\/strong\u003e\n    The N6210 module uses a single lithium-ion cell pack at 7.2V to back its onboard cache. The BMS handshakes with the controller firmware to confirm cell voltage and capacity before the controller authorises write-back mode. A mismatch in voltage range or a missing handshake keeps the system locked in write-through regardless of physical installation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through full charge and discharge on the bench. The BMS reported cell voltage within the expected 7.2V nominal range, and the protection circuit triggered correctly at both high-voltage and low-voltage cutoff thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eLearn cycle after installation:\u003c\/strong\u003e\n    After fitting this battery, trigger a learn cycle from the controller management interface — in ONTAP use \u003ccode\u003esystem controller battery show\u003c\/code\u003e, in StorCLI use \u003ccode\u003e\/cx bbu show\u003c\/code\u003e. The controller stays in write-through mode until the learn cycle completes and calculates a new backup window estimate against the fresh cell. This takes 24–72 hours under normal operating load.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRAID controller staying in write-through mode after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eReplacing the physical battery does not automatically restore write-back mode. The controller firmware must run a full learn cycle to recalibrate the backup window against the new cell's actual capacity. Until that cycle completes and the backup window estimate meets the controller's minimum threshold, write-back stays disabled. On IBM systems running ONTAP, check progress with \u003ccode\u003esystem controller battery show\u003c\/code\u003e and confirm the state moves from \"learning\" to \"ready.\"\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eManagement console reporting a battery error days after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe N6210 controller runs its battery health assessment on a timed interval — not at boot and not at the moment of installation. If the scheduled assessment fires before the learn cycle finishes, the controller logs a battery error because the backup window estimate is still undefined. This is not a faulty cell. Wait for the learn cycle to complete fully, then allow one scheduled assessment to run. If the error clears, the battery is functioning correctly; if it persists, check that cell voltage at the connector reads between 7.0V and 8.4V with a multimeter.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416090312794,"sku":"BWCS-NEX909BU-1","price":100.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416090345562,"sku":"BWCS-NEX909BU-2","price":118.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416090378330,"sku":"BWCS-NEX909BU-3","price":131.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NEX909BU-1.webp?v=1779760241","url":"https:\/\/batteryweb.com\/products\/ibm-n6210-replacement-battery-72v-6800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}