{"product_id":"hp-msa1510i-iscsi-controller-replacement-battery-48v-250mah-ni-mh","title":"HP MSA1510i 120978-001 Replacement Battery 4.8V 250mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHP MSA1510i iSCSI Controller — 4.8V Ni-MH Replacement Battery (120978-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V, 250mAh Ni-MH cache backup battery for the HP MSA1510i iSCSI RAID controller and compatible ProLiant server platforms. It backs up the controller's write cache during a power loss event, preventing data corruption when main power drops. Voltage and cell chemistry match the OEM specification at 4.8V Ni-MH.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMSA1510i and ProLiant platform compatibility:\u003c\/strong\u003e\n    These controllers share the same 4.8V Ni-MH cell format, connector pinout, and BMS handshake across the MSA1510i, ML370, ML570, and rx2600 lines. The cache protection circuit expects the same charge termination profile across all supported platforms.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge, load, and simulated power-loss cycles on the bench. The BMS accepted the cell, completed the handshake, and the controller transitioned from write-through to write-back after the learn cycle finished.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap learn cycle requirement:\u003c\/strong\u003e\n    After installing this battery in the MSA1510i or a ProLiant array controller, trigger a learn cycle from the management interface. Without it, the controller cannot calculate the backup window for the new cell and will hold write-through mode indefinitely — no cache performance until the cycle completes.\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 battery replacement is almost always a learn cycle that never ran, not a faulty cell. The controller suspends write-back until it recalibrates the backup window estimate against the new cell's actual charge curve. On HP array controllers, use the ACU (Array Configuration Utility) or HPSSACLI to initiate the learn cycle manually. Write-back re-enables once the controller confirms the cell holds charge above the minimum backup threshold — typically after one full charge and discharge cycle.\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\"\u003eHP array controllers run their battery self-assessment on a timed schedule, not at boot. If the console flags a battery error two or three days after a swap, it means the scheduled assessment ran before the learn cycle finished recalibrating the new cell. The reported error clears on the next assessment cycle once the backup window estimate is valid. Check the controller event log — if the error timestamp aligns with the assessment interval rather than the swap time, let the learn cycle complete before treating it as a failed cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416093851738,"sku":"BWCS-RAC4200SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416093884506,"sku":"BWCS-RAC4200SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416093917274,"sku":"BWCS-RAC4200SL-3","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RAC4200SL-1.webp?v=1779760285","url":"https:\/\/batteryweb.com\/products\/hp-msa1510i-iscsi-controller-replacement-battery-48v-250mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}