{"product_id":"ibm-2780-replacement-battery-37v-3400mah-li-ion","title":"IBM 97P4846 RAID Controller Replacement Battery 3.7V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM 2780 RAID Controller — 3.7V Li-ion Replacement Battery (97P4846)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 3400mAh Li-ion cell replaces the backup battery on the IBM RAID controller cache module. It fits the 2780, 5580, 5708, and 5780 controller families, along with 23 additional compatible models. The battery holds write-cache data in SRAM during a power loss, protecting in-flight writes until the host recovers.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eController family compatibility:\u003c\/strong\u003e\n    These controllers share the same cache backup architecture — single Li-ion cell, 3.7V nominal rail, same BMS handshake for learn-cycle signalling. One replacement cell covers the full range of affected IBM storage controllers listed above.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full charge and discharge sequence, confirmed BMS communication with the controller, and verified that the backup window estimate updated after the learn cycle completed. The cell held 3400mAh within normal tolerance across three consecutive cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation learn cycle:\u003c\/strong\u003e\n    After fitting this cell, trigger a battery learn cycle from the management interface — use \u003ccode\u003esystem controller battery show\u003c\/code\u003e in ONTAP or \u003ccode\u003eStorCLI \/cx bbu show\u003c\/code\u003e for Broadcom\/LSI platforms. The controller stays in write-through mode until that cycle completes and recalibrates the backup window 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\"\u003eSwapping the physical cell does not automatically switch the controller back to write-back mode. The controller's firmware holds write-through until it has completed a full learn cycle and confirmed the backup window meets its internal threshold — typically 72 hours or more under normal load. Until that cycle finishes, the controller treats the new battery as unverified. Check cycle status in ONTAP with \u003ccode\u003esystem controller battery show\u003c\/code\u003e; the state should move from \"charging\" through \"learning\" before write-back re-enables.\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\"\u003eIBM storage controllers run scheduled battery health assessments on a timed interval — not at the moment you install a new cell. If the system's next assessment window falls one or two days after the swap, the console may flag the battery as failed before the learn cycle has had time to complete. This is not a fault with the replacement cell. Wait for the scheduled assessment to run after the learn cycle finishes, then confirm the status clears. If the error persists beyond 96 hours post-cycle, check cell voltage directly — it should read between 3.6V and 4.2V at rest.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416092967002,"sku":"BWCS-AS2780SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416092999770,"sku":"BWCS-AS2780SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416093032538,"sku":"BWCS-AS2780SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AS2780SL_1.webp?v=1779760264","url":"https:\/\/batteryweb.com\/products\/ibm-2780-replacement-battery-37v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}