{"product_id":"ibm-as400-replacement-battery-36v-800mah-ni-mh","title":"IBM AS400 RAID Controller Replacement Battery 3.6V 44L0305","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM AS400 \/ ServeRAID 3H — 3.6V Ni-MH Replacement Battery (44L0305)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V, 800mAh Ni-MH cell replaces the cache backup battery on IBM AS400 and AS400 i5 RAID controllers, including ServeRAID 3H and compatible units. It holds the controller's write cache during a power loss event, preventing data corruption in the RAID array. Voltage and capacity match the OEM specification: 3.6V, 800mAh (2.88Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAS400 and ServeRAID 3H compatibility:\u003c\/strong\u003e\n    These controllers share the same 3.6V Ni-MH cell format, connector pinout, and BMS handshake threshold. The same cell services the AS400 i5 and the 63H0935 board variant because they all draw from an identical voltage rail with the same charge termination logic.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, full-load discharge, and BMS communication checks on a ServeRAID 3H controller. The BMS accepted the cell without error flags and completed charge termination at the correct delta-V cutoff for Ni-MH chemistry.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap learn cycle on the AS400 controller:\u003c\/strong\u003e\n    After fitting this cell, trigger the battery learn cycle from the controller management interface — StorCLI: \u003ccode\u003estorCLI \/cx bbu show\u003c\/code\u003e. The controller holds write-through mode until the learn cycle recalibrates the backup window estimate against the new cell's actual capacity. Skipping this step means write-back mode never re-engages.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the AS400 RAID controller stays in write-through mode after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe controller does not automatically switch back to write-back mode when a new cell is installed. It enters write-back only after the learn cycle completes and the BMS has calculated a new backup window from a full charge-discharge run on the replacement cell. Until that cycle finishes — which can take 24 to 72 hours under normal load — the controller treats the battery as unverified and keeps write-through mode active. Manually initiating the learn cycle from the management interface shortens this window rather than waiting for the scheduled automatic cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eManagement console still showing a battery error days after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AS400 controller's battery self-assessment does not run at boot — it runs on a timed interval set in firmware, typically 24 to 90 days depending on configuration. If the console flags a battery error shortly after a swap, the assessment was already scheduled before the swap occurred. The new cell must complete at least one full learn cycle before the controller logs a clean battery status. Run \u003ccode\u003estorCLI \/cx bbu show\u003c\/code\u003e to confirm learn cycle progress; the error clears once the cycle completes and the backup window reads above 0 seconds.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416093458522,"sku":"BWCS-AS400SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416093491290,"sku":"BWCS-AS400SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416093524058,"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\/ibm-as400-replacement-battery-36v-800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}