{"product_id":"ibm-n6210-replacement-battery-72v-5200mah-li-ion","title":"IBM N6210 RAID Controller Replacement Battery 7.2V 5200mAh","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 5200mAh Li-ion battery is a direct cache backup replacement for the IBM N6210 RAID controller. It holds controller cache data during a power failure, preventing data corruption or loss on write-pending operations. Voltage and capacity match the N6210's backup power spec at 7.2V and 37.44Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eN6210 cache backup role:\u003c\/strong\u003e\n    The N6210 controller holds unwritten cache data in DRAM. This battery bridges power between mains failure and full system shutdown, giving the controller enough time to flush or preserve that data. Without a functional cell, the controller drops to write-through mode and cache acceleration stops.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge and discharge cycles, confirmed BMS communication across the connector, and verified the cell voltage held within the N6210's expected acceptance window. The BMS handshake cleared without faults on our test unit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation learn cycle:\u003c\/strong\u003e\n    After fitting this battery, initiate a learn cycle from the management interface — on ONTAP use \u003ccode\u003esystem controller battery show\u003c\/code\u003e to monitor status. The controller remains in write-through mode until the learn cycle completes and recalibrates the backup window estimate against the new cell capacity.\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\"\u003eSwapping the battery does not automatically trigger recalibration. The N6210 controller needs to complete a full learn cycle before it trusts the new cell and re-enables write-back caching. Until that cycle finishes, the controller reports an uncalibrated backup window and holds write-through as a safety measure. On ONTAP, track progress with \u003ccode\u003esystem controller battery show\u003c\/code\u003e — write-back resumes once the cycle status clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eONTAP showing a battery error days after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe N6210 does not run a battery assessment at boot — it runs on a scheduled timed interval. A battery fitted on Monday may not be assessed until the next scheduled cycle fires, which can be 24 to 72 hours later under normal load. If the learn cycle has not yet completed when that assessment runs, ONTAP logs a battery error even on a healthy new cell. Wait for the learn cycle to finish, then re-check with \u003ccode\u003esystem controller battery show\u003c\/code\u003e before treating the error as a hardware fault.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416090509402,"sku":"BWCS-NEX908BU-1","price":89.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416090542170,"sku":"BWCS-NEX908BU-2","price":105.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416090574938,"sku":"BWCS-NEX908BU-3","price":116.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NEX908BU-1.webp?v=1779760241","url":"https:\/\/batteryweb.com\/products\/ibm-n6210-replacement-battery-72v-5200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}