{"product_id":"netapp-replacement-battery-72v-2600mah-li-ion","title":"NetApp 271-00024 RAID Controller Replacement Battery 7.2V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNetApp 271-00024 — 7.2V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V, 2600mAh Li-ion replacement battery for NetApp RAID controller backup power units. It supplies emergency power to the controller's write cache during an unexpected power loss, allowing buffered data to flush safely to disk. OEM part numbers 271-00024, 271-00024+C0, and ES3242 all cross to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRAID controller cache backup role:\u003c\/strong\u003e\n    These controllers hold write cache in volatile memory. The battery bridges power loss events long enough for the controller to destage that cache to non-volatile storage. Voltage, cell format, and BMS handshake must match the original — a mismatch causes the controller to lock in write-through mode permanently.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell under simulated cache-backup discharge loads and confirmed the BMS communicates charge state correctly to the controller management interface. The cell reached rated capacity within two full learn cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eLearn cycle after installation:\u003c\/strong\u003e\n    After fitting this battery, initiate the learn cycle from your controller interface — ONTAP: \u003ccode\u003esystem controller battery show\u003c\/code\u003e; Broadcom\/LSI: \u003ccode\u003eStorCLI \/cx bbu show\u003c\/code\u003e. The controller stays in write-through mode until the learn cycle completes and the backup window is recalibrated against the new cell's actual 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\"\u003eWrite-through mode is not a fault — it is the controller's default when it cannot confirm the battery can sustain the backup window. After a battery swap, the controller has no learned data for the new cell, so it holds in write-through until a full learn cycle recalibrates the backup window estimate. On ONTAP systems, run \u003ccode\u003esystem controller battery show\u003c\/code\u003e to check learn cycle status. The controller returns to write-back mode automatically once the cycle completes, typically within 24–72 hours under normal array load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eManagement console showing a battery error days after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNetApp controllers run their battery assessment on a timed schedule, not at boot — so an error can surface 24–72 hours after a swap even when the cell is functioning correctly. If the learn cycle has not finished, the controller reports an indeterminate state as an error. Check learn cycle progress first: a completed cycle with a voltage reading above 7.0V rules out a cell fault. If the error persists after cycle completion, reseat the battery connector and re-run \u003ccode\u003esystem controller battery show\u003c\/code\u003e to force a fresh status poll.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416089559130,"sku":"BWCS-NEX900BU-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416089591898,"sku":"BWCS-NEX900BU-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416089624666,"sku":"BWCS-NEX900BU-3","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NEX900BU-1.webp?v=1779760241","url":"https:\/\/batteryweb.com\/products\/netapp-replacement-battery-72v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}