{"product_id":"ibm-95p7881-replacement-battery-72v-3400mah-li-ion","title":"IBM 95P7881 RAID Controller Replacement Battery 7.2V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM 95P7881 — 7.2V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V 3400mAh Li-ion battery for the IBM 95P7881 RAID controller. It provides backup power to preserve cache data when mains power drops unexpectedly. Without a functioning battery, the controller falls back to write-through mode and cache protection is lost.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e95P7881 controller fit:\u003c\/strong\u003e\n    The 95P7881 uses a dedicated battery-backed write cache circuit. The controller checks cell voltage and BMS state at boot — if either falls outside spec, write-back mode is disabled regardless of apparent charge level.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell under a simulated cache-flush load and confirmed the BMS reported charge and backup-window data to the controller correctly. The cell held voltage above the minimum cutoff through full discharge.\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 the controller management interface — on Broadcom\/LSI controllers use \u003ccode\u003eStorCLI \/cx bbu show\u003c\/code\u003e to monitor progress. The controller stays in write-through mode until the learn cycle completes and the backup window estimate is recalibrated against the new cell. This typically takes 24–72 hours under normal server 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\"\u003eSwapping the battery does not automatically restore write-back mode. The controller must complete a full learn cycle before it trusts the new cell's backup window estimate. Until that cycle finishes, the controller treats the battery as unqualified and keeps cache writes in write-through mode as a data protection measure. Trigger the learn cycle manually from your management interface rather than waiting for the next scheduled auto-cycle.\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\"\u003eBattery health assessments on most RAID controllers run on a timed interval — not at the moment you install a new cell. If the scheduled self-test fires before the learn cycle has fully completed, the controller logs an error because the backup window figure is still being calculated. This is not a faulty cell. Let the learn cycle finish, then check the battery status again with \u003ccode\u003eStorCLI \/cx bbu show\u003c\/code\u003e — the error clears once the controller has a valid backup window reading.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416090804314,"sku":"BWCS-NEX910BU-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416090837082,"sku":"BWCS-NEX910BU-2","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416090869850,"sku":"BWCS-NEX910BU-3","price":85.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NEX910BU-1.webp?v=1779760241","url":"https:\/\/batteryweb.com\/products\/ibm-95p7881-replacement-battery-72v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}