{"product_id":"adaptec-serial-attached-scsi-raid-controllers-replacement-battery-37v-1800mah-li-ion","title":"Adaptec BAT-00011-01-A RAID Controller Compatible Battery 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAdaptec Serial Attached SCSI RAID Controllers — 3.7V Li-ion Replacement Battery (BAT-00011-01-A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1800mAh Li-ion cell replaces the backup cache battery in Adaptec RAID controller cards, including the 4800SAS, 4805SAS, and 2218300-R. It powers the controller's cache module during an unexpected power loss, holding in-flight write data until the system recovers. Without a functional cell, the controller drops to write-through mode and cache-backed write performance is gone.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e4800SAS \/ 4805SAS \/ 2218300-R compatibility:\u003c\/strong\u003e\n    These controllers share the same cache backup architecture and use the same connector pinout and BMS handshake protocol, which is why one cell covers the group. Voltage tolerance on the backup rail is narrow — the BMS will reject a cell outside its acceptance window at initialisation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge-discharge cycle on a live controller. The BMS accepted the cell, completed its initialisation handshake, and the backup window was calculated after the learn cycle finished. No fault codes were thrown post-cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap learn cycle:\u003c\/strong\u003e\n    After fitting the new cell, initiate the battery learn cycle from your controller management interface — StorCLI: \u003ccode\u003e\/cx bbu show\u003c\/code\u003e; ONTAP: \u003ccode\u003esystem controller battery show\u003c\/code\u003e. The controller holds in write-through mode until the learn cycle 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\"\u003eWrite-through mode after a cell swap is almost always a learn cycle that hasn't run yet — not a faulty battery. The controller will not switch back to write-back until it has completed a full charge-discharge assessment and confirmed the backup window meets its internal threshold. On Adaptec cards this cycle can take 24–72 hours under normal server load. Check status with StorCLI \u003ccode\u003e\/cx bbu show\u003c\/code\u003e and confirm the learn cycle state shows \"Active\" or \"Complete\" before assuming the cell is defective.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBackup window estimate shorter than expected after new cell install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA shorter-than-expected backup window on the first assessment is normal — the controller's algorithm starts conservative when it has no history with the new cell. Capacity characterisation improves over two to three full learn cycles as the BMS builds an accurate discharge curve. The reported backup window will extend after each completed cycle until it stabilises. If the window remains below 72 hours after three cycles, check that the cell resting voltage is reading at or above 3.6V in the management interface.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416094244954,"sku":"BWCS-ABM600SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416094277722,"sku":"BWCS-ABM600SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416094310490,"sku":"BWCS-ABM600SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ABM600SL-1.webp?v=1779760263","url":"https:\/\/batteryweb.com\/products\/adaptec-serial-attached-scsi-raid-controllers-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}