{"product_id":"alaris-medicalsystems-infusion-pump-531-replacement-battery-12v-1800mah-ni-mh","title":"Alaris Medicalsystems Infusion Pump 531 Replacement Battery 12V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAlaris Medicalsystems Infusion Pump 231\/531 — 12V Ni-MH Replacement Battery (125-00-444900968)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 12V 1800mAh Ni-MH battery replaces OEM part 125-00-444900968 in the Alaris Medicalsystems Infusion Pump 231 and Infusion Pump 531. These pumps deliver IV fluids and medications under controlled flow rates, so a failed or degraded battery is a direct clinical concern. Capacity is 1800mAh (21.6Wh) — matching OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInfusion Pump 231 and 531 compatibility:\u003c\/strong\u003e\n    Both models share the same 12V battery rail, connector pinout, and BMS handshake protocol. The 125-00-444900968 part number covers both variants — no adapter or wiring change needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the pump's power-on self-test sequence and monitored BMS communication. The charge IC accepted the cell without fault codes on the first full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePower-on self-test after installation:\u003c\/strong\u003e\n    After fitting the battery, allow the pump to complete its full startup self-test without interruption. The BMS runs a verification check at boot — cutting power during this window causes a false battery fault that persists until the next complete reboot cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSelf-test failure after battery swap on the Infusion Pump 531\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Pump 531's BMS runs a cell-verification routine at every startup. A fresh Ni-MH cell that hasn't completed at least one full charge-discharge cycle may sit slightly below the BMS acceptance threshold, triggering a self-test fault. This is a BMS learn-cycle issue, not a dead cell. Run one complete charge from flat to full, then reinstall and allow the pump to complete its boot sequence before clinical use.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator not reaching 100% on the first charge after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Alaris pump's charge IC applies a conservative current limit when it first reads a new Ni-MH cell — particularly one that has self-discharged during storage. The controller reads the lower open-circuit voltage and caps the charge rate until it builds a history with the cell. Run a full first charge uninterrupted; the cell should reach 12V resting voltage and the indicator should complete normally on the second cycle. If resting voltage remains below 11.5V after a full charge, check the charger contacts for oxidation before replacing the cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381433139290,"sku":"BWCS-AMS231MD-1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381433172058,"sku":"BWCS-AMS231MD-2","price":52.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381433204826,"sku":"BWCS-AMS231MD-3","price":57.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AMS231MD-1.webp?v=1778900749","url":"https:\/\/batteryweb.com\/products\/alaris-medicalsystems-infusion-pump-531-replacement-battery-12v-1800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}