{"product_id":"fresenius-mcm-replacement-battery-12v-2000mah-ni-mh","title":"Fresenius MCM E-1520 Replacement Battery 12V 2000mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFresenius MCM400 \/ Argus 400 Series — 12V Ni-MH Replacement Battery (E-1520)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V, 2000mAh Ni-MH replacement battery for the Fresenius MCM and MCM400 series infusion pumps, including the MCM400D and Argus 400. It replaces OEM part numbers E-1520, 120049, and BATT\/110049. The battery restores portable operation to the pump when the original cell has degraded past the device's minimum threshold.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMCM and Argus 400 platform compatibility:\u003c\/strong\u003e\n    These models share the same 12V power rail, connector pinout, and BMS handshake protocol. A single cell design covers all variants in this pump family without any hardware modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the MCM400 charge and self-test sequence. The BMS accepted the cell on the first cycle, logged no fault codes, and held charge within spec across five consecutive discharge runs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, let the pump complete its full power-on self-test without interruption. The MCM runs a BMS verification routine at startup — cutting power mid-sequence causes a latching battery fault that will not clear until the next clean reboot from a fully charged state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MCM400 alarms low battery on a freshly charged replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MCM400 BMS calibrates its charge thresholds against the internal resistance profile of the fitted cell. A new Ni-MH cell has a slightly higher internal resistance than a conditioned one, so the pump reads the new cell as below threshold even at full charge. This is not a fault with the battery — it resolves after one complete charge-discharge cycle. Run the pump from full charge to the low-battery cutoff point, then charge it fully again. After that cycle, the BMS recalibrates and the alarm clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePump will not power on after battery sat in storage\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge during storage. If the replacement cell has been sitting for several months, its voltage may have dropped below the MCM's BMS recovery threshold — typically around 10.5V for a 12V Ni-MH pack. The BMS will not attempt to charge a cell it reads as deeply discharged. Connect the pump to mains power and leave it on charge for at least 12 hours before attempting to power on. If the charge indicator does not respond within 30 minutes of connection, measure the battery pack voltage directly — anything below 9V requires a trickle pre-charge before the main charge IC will engage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381458403418,"sku":"BWCS-FRM400MD-1","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381458436186,"sku":"BWCS-FRM400MD-2","price":60.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381458468954,"sku":"BWCS-FRM400MD-3","price":67.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FRM400MD-1.webp?v=1778900983","url":"https:\/\/batteryweb.com\/products\/fresenius-mcm-replacement-battery-12v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}