{"product_id":"dell-replacement-battery-36v-800mah-ni-mh","title":"Dell 44V3696 RAID Controller Replacement Battery 3.6V 800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDell RAID Controller Cache Battery — 3.6V Ni-MH Replacement Battery (44V3696)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 800mAh Ni-MH replacement battery for Dell RAID controller cache backup circuits. It replaces OEM part numbers 44V3696, 44H8429, and 09L5609. When main power fails, this cell maintains the controller's write cache so queued data is not lost before the host system recovers.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRAID cache backup role:\u003c\/strong\u003e\n    These part numbers share a common voltage rail and connector footprint used across several Dell RAID controller generations. The BMS handshake confirms cell chemistry and state-of-charge before the controller transitions from write-through to write-back mode. A mismatched or unrecognised cell keeps the controller in write-through permanently.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge acceptance and discharge profiling on a RAID controller bench rig. The BMS accepted the cell, completed charge termination cleanly at delta-V cutoff, and reported state-of-charge within the expected window for Ni-MH at this capacity.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eLearn cycle after installation:\u003c\/strong\u003e\n    After fitting this cell, initiate the battery learn cycle from your controller management interface — StorCLI: \u003ccode\u003estorcli \/cx bbu start learn\u003c\/code\u003e, or ONTAP: \u003ccode\u003esystem controller battery show\u003c\/code\u003e. The controller stays in write-through mode until the learn cycle completes and recalibrates the backup window estimate against the new cell. This takes 24–72 hours under normal 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\"\u003eWrite-through mode locks in when the controller has not completed a learn cycle against the new cell. Swapping the battery resets the backup window estimate to zero — the controller will not re-enable write-back until it confirms the cell can sustain the cache across a full discharge and recharge cycle. This is a protection behaviour, not a fault. Trigger the learn cycle manually via StorCLI: \u003ccode\u003estorcli \/cx bbu start learn\u003c\/code\u003e and allow the cycle to run without interruption.\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\"\u003eMost Dell RAID controllers run their battery assessment on a timed schedule — not at boot, and not immediately after a swap. If the scheduled self-test runs before the learn cycle is complete, the controller logs a battery error because the backup window estimate is still uncalibrated. The error clears once the learn cycle finishes and the controller recalculates the window with real discharge data. Check status in StorCLI using \u003ccode\u003estorcli \/cx bbu show\u003c\/code\u003e and confirm the learn cycle state shows \"Active\" or \"Complete\" before treating the error as a hardware fault.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416093556826,"sku":"BWCS-AS400SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416093589594,"sku":"BWCS-AS400SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416093622362,"sku":"BWCS-AS400SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AS400SL-1.webp?v=1779760263","url":"https:\/\/batteryweb.com\/products\/dell-replacement-battery-36v-800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}