{"product_id":"natus-audiometer-algo-3-replacement-battery-74v-2600mah-li-ion","title":"Natus Audiometer Algo 3 Replacement Battery 7.4V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNatus Algo 3 \/ Algo 3i — 7.4V Li-ion Replacement Battery (88889209)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 2600mAh Li-ion battery replaces part number 88889209 in the Natus Algo 3 and Algo 3i portable newborn hearing screeners. These devices perform automated auditory brainstem response (AABR) testing in hospital nurseries and pediatric clinics. Keeping a charged spare on hand avoids gaps in screening throughput during shift changes or high-census periods.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAlgo 3 and Algo 3i compatibility:\u003c\/strong\u003e\n    Both the Algo 3 and Algo 3i share the same battery bay, connector pinout, and BMS communication protocol — one part number covers both units. The voltage rail and cell configuration are identical across the two variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge cycles and monitored BMS handshake behavior. The protection circuit responded correctly to charge termination and load cutoff events without tripping false fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use self-test protocol:\u003c\/strong\u003e\n    After installing this battery, allow the Algo 3 to complete its full power-on self-test without interruption. The device BMS runs a verification routine at startup — cutting power during this sequence can trigger a persistent battery fault that won't clear until the next complete 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 Algo 3 alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Algo 3 BMS calibrates its state-of-charge thresholds against the OEM cell's established charge curve. A new replacement cell has not yet completed a full learn cycle, so the BMS can misread the actual charge state and trip the low-battery alarm even when the cell is fully charged. This is not a fault with the battery — it resolves after one complete charge-to-discharge cycle. Run the battery down to automatic shutoff, then charge it fully before the device returns to clinical rotation. After that conditioning cycle, the BMS reads state-of-charge accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAlgo 3 shutting off mid-screening with no low battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Algo 3 applies a short, elevated load burst during AABR stimulus delivery. In the first ten cycles, a new Li-ion cell has higher internal resistance than a broken-in cell, which causes a momentary voltage sag under that load. If the sag crosses the BMS undervoltage cutoff threshold, the device shuts off without a warning — the event is too fast for the alarm to trigger. Measure resting voltage immediately after a shutdown; if it reads above 7.0V, the cell is not depleted and internal resistance is the cause. Complete five to ten full charge-discharge cycles to bring cell resistance down to normal operating range before relying on the device for uninterrupted screenings.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381455355994,"sku":"BWCS-NTA300MD-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381455388762,"sku":"BWCS-NTA300MD-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381455421530,"sku":"BWCS-NTA300MD-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NTA300MD-1.webp?v=1778901015","url":"https:\/\/batteryweb.com\/products\/natus-audiometer-algo-3-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}