{"product_id":"zoll-univent-731-ventilator-replacement-battery-148v-6600mah-li-ion","title":"ZOLL 703-0731-00 UNIVENT 731 Replacement Battery 14.8V 6600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZOLL UNIVENT 731 \/ Eagle II \/ EMV+ 731 — 14.8V Li-ion Replacement Battery (703-0731-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.8V 6600mAh (97.68Wh) lithium-ion replacement battery for the ZOLL UNIVENT 731 Ventilator, Eagle II, EMV+ 731, and 330 Portable Multifunction Aspirator. These devices run on the same 4S lithium-ion pack with matching connector and BMS handshake requirements. Capacity figure is taken from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUNIVENT 731, Eagle II, EMV+ 731, and 330 Aspirator compatibility:\u003c\/strong\u003e\n    All four platforms share the same 14.8V four-cell series configuration, physical form factor, and OEM connector pinout. The BMS in each device reads the same cell voltage thresholds, so one pack services all four without hardware modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through full charge and load cycles on a UNIVENT 731 test unit. The BMS completed voltage verification, accepted the charge curve without fault flags, and held steady under simulated ventilator draw without triggering a protection cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePower-on self-test protocol after installation:\u003c\/strong\u003e\n    After fitting this battery, allow the UNIVENT 731 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this window causes a false battery fault that latches and persists until the next full 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 UNIVENT 731 alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe UNIVENT 731's charge IC applies a conservative acceptance threshold on first contact with a new cell pack. If the resting voltage reads slightly below the OEM baseline — common on cells fresh from storage — the device flags a low-battery condition even though the pack is fully charged. This is a BMS calibration issue, not a cell fault. Run one complete charge-to-discharge-to-full-charge cycle before treating the alarm as a genuine capacity warning. After that cycle, the BMS recalibrates its reference points and the false alarm clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice will not power on after battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-ion packs self-discharge during storage. If the cell voltage drops below approximately 2.5V per cell — 10V at pack level for a 4S configuration — the UNIVENT 731's BMS enters deep-discharge lockout and blocks power delivery as a protection measure. The device will appear completely dead, with no display or alarm activity. Place the battery on a compatible charger and leave it connected for a minimum of two full hours before attempting to power the device on. If the pack recovers above the BMS threshold, normal startup resumes at that point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381392080986,"sku":"BWCS-ZPU731MD-1","price":380.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381392113754,"sku":"BWCS-ZPU731MD-2","price":454.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381392146522,"sku":"BWCS-ZPU731MD-3","price":509.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZPU731MD-1.webp?v=1778900565","url":"https:\/\/batteryweb.com\/products\/zoll-univent-731-ventilator-replacement-battery-148v-6600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}