{"product_id":"marquette-mac-8-replacement-battery-192v-8000mah-ni-mh","title":"Marquette MAC 8 Replacement Battery 19.2V 8000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMarquette MAC 8 Series — 19.2V Ni-MH Replacement Battery (MGN0118)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 19.2V Ni-MH battery replaces the OEM pack in the Marquette MAC 8, Max Personal, Mac Personal Monitor, and Mac Stress portable electrocardiographs. Capacity is 8000mAh (153.6Wh). It covers mobile ECG recording sessions where AC power is not available.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMAC 8 and Mac Personal platform fit:\u003c\/strong\u003e\n    These models share the same 19.2V bus, connector pinout, and BMS handshake protocol. One battery services the full platform without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge and discharge cycles through the MAC 8's onboard charge IC. The BMS accepted the cell stack without fault codes on the third cycle, and the state-of-charge register tracked correctly across the full voltage window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePower-on self-test protocol:\u003c\/strong\u003e\n    After installing this battery, let the MAC 8 complete its full startup self-test without interruption. The device runs a BMS verification pass at boot. Cutting power during that sequence logs a false battery fault that persists until the next clean reboot cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MAC 8 reports a battery fault after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMarquette's charge IC sets its pass threshold against the OEM cell chemistry profile. A new replacement cell has not yet established a stable internal resistance baseline, so the first one or two charge cycles may fall just short of the acceptance window. The BMS logs this as a fault rather than a low-capacity warning. Run one full charge-discharge cycle before placing the unit into clinical rotation — the charge IC recalibrates its threshold on the next completed cycle and the fault clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMAC 8 will not power on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–2% per day. A battery that has been in storage for several weeks can drop below the MAC 8's minimum BMS recovery threshold — typically around 14V on a 19.2V pack — and the device will not respond to the power button at all. Connect the unit to AC mains and leave it on charge for a minimum of four hours before attempting to power on. If the charge LED does not illuminate within ten minutes of connecting AC, check the connector seating and confirm the wall adapter is delivering voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381435105370,"sku":"BWCS-MRP800MD-1","price":225.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381435138138,"sku":"BWCS-MRP800MD-2","price":268.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381435170906,"sku":"BWCS-MRP800MD-3","price":300.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRP800MD-1.webp?v=1778900787","url":"https:\/\/batteryweb.com\/products\/marquette-mac-8-replacement-battery-192v-8000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}