{"product_id":"cortex-metamax-3b-replacement-battery-74v-2200mah-li-ion","title":"Cortex Metamax 3B 7.4V 2200mAh Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCortex Metamax 3B — 7.4V Li-ion Replacement Battery (000-00-039)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2200mAh Li-ion replacement battery for the Cortex Metamax 3B portable metabolic analyser. It replaces OEM part number 000-00-039. The Metamax 3B is a clinical-grade handheld diagnostic device, so the battery must meet the BMS handshake and charge profile the device expects.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMetamax 3B platform fit:\u003c\/strong\u003e\n    The Metamax 3B uses a specific 7.4V two-cell Li-ion configuration with a BMS that verifies cell chemistry at startup. This replacement matches that voltage rail and connector pinout so the device recognises the pack and clears its battery validation check.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge, discharge, and power-on self-test sequences on the Metamax 3B platform. The BMS handshake completed without fault codes, and the cell voltage held within the device's accepted window across the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup protocol:\u003c\/strong\u003e\n    After installing this battery, allow the Metamax 3B to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at every boot — cutting power during this window writes a false battery fault to memory that persists until the next clean full reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Metamax 3B flags a battery fault on the first charge cycle\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Metamax 3B charge IC applies a conservative upper threshold when it sees a new cell for the first time. It compares internal resistance and charge acceptance rate against stored OEM baseline values. A fresh cell's impedance profile sits outside that baseline until the BMS completes one full charge-discharge learn cycle. Run one complete cycle before clinical use and the fault clears on its own.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator stuck below 100% on first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge, the Metamax 3B charge controller caps the termination voltage slightly below the cell's rated ceiling while it reads the new pack's capacity. This is not a faulty battery — it is the charge IC limiting current until it has mapped the cell. The indicator will reach 100% on the second or third charge once the BMS has logged a full capacity baseline. Confirm full charge by checking that the device reports a resting cell voltage of 8.2V–8.4V at the terminal pins.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381430976602,"sku":"BWCS-CRM300MD-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381431009370,"sku":"BWCS-CRM300MD-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381431042138,"sku":"BWCS-CRM300MD-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CRM300MD-1.webp?v=1778900750","url":"https:\/\/batteryweb.com\/products\/cortex-metamax-3b-replacement-battery-74v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}