{"product_id":"i-stat-mcp9819-065-replacement-battery-48v-2000mah-ni-mh","title":"I-Stat MJ09 MCP9819-065 Replacement Battery 4.8V 2000mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eI-Stat MCP9819-065 — 4.8V Ni-MH Replacement Battery (MJ09)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V, 2000mAh Ni-MH replacement battery for the I-Stat MCP9819-065 handheld blood gas analyzer. It matches the OEM MJ09 specification and fits the analyzer's battery bay directly. Voltage, capacity, and connector position are confirmed against the original cell pack.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMCP9819-065 analyzer fit:\u003c\/strong\u003e\n    The MCP9819-065 draws power through a fixed 4.8V rail with a BMS handshake that verifies cell chemistry and pack voltage at startup. This replacement matches both parameters, so the analyzer's charge IC and self-test routine accept it without throwing a battery fault code.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge, full discharge, and recharge on a compatible I-Stat analyzer platform. The BMS completed its verification sequence, the charge indicator progressed normally, and the pack held within spec across the test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, leave the analyzer powered on through its full power-on self-test without interrupting it. The MCP9819-065 runs a BMS verification loop at startup — cutting power mid-sequence stores a false battery fault that persists until the next clean reboot, even though the cell is fine.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MCP9819-065 alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe I-Stat analyzer's BMS stores a learned capacity profile from the previous cell. A fresh Ni-MH pack hasn't yet built a charge history that matches this profile, so the BMS flags it as low even when it's fully charged. This is a learning-cycle issue, not a cell defect. Run one complete charge-to-discharge-to-recharge cycle before clinical use. After that first cycle, the BMS recalibrates its threshold to the new cell and the alarm clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAnalyzer won't power on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge during storage, and the MCP9819-065 BMS has a minimum recovery threshold — typically around 4.0V for a 4.8V pack — below which it refuses to initiate the boot sequence at all. If the analyzer shows nothing on power-on, place it on charge for at least two hours before attempting to power it on again. A deeply discharged pack needs the charge IC to trickle-charge the cells back above the BMS recovery floor before normal operation resumes. If the analyzer still won't boot after two hours on charge, check that the dock or charger is outputting the correct 5V supply voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381509783642,"sku":"BWCS-IMC819MD-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381509816410,"sku":"BWCS-IMC819MD-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381509849178,"sku":"BWCS-IMC819MD-3","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IMC819MD-1.webp?v=1778901339","url":"https:\/\/batteryweb.com\/products\/i-stat-mcp9819-065-replacement-battery-48v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}