{"product_id":"nonin-8500-replacement-battery-6v-2000mah-ni-mh","title":"Nonin 8500 Pulse Oximeter Replacement Battery 6V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNonin 8500 — 6V Ni-MH Replacement Battery (GP200AAH-051PTC)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V, 2000mAh Ni-MH replacement battery for the Nonin 8500 pulse oximeter. It fits the handheld clinical device used to measure blood oxygen saturation and heart rate. The OEM part number is GP200AAH-051PTC.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNonin 8500 fit:\u003c\/strong\u003e\n    The 8500 runs a fixed 6V rail with a specific connector footprint and BMS handshake tied to Ni-MH chemistry. This cell matches that voltage, connector, and chemistry so the device's charge controller operates as intended.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery through the Nonin 8500's full startup sequence, including the power-on self-test. The BMS accepted the cell, completed its verification cycle, and the device displayed no fault codes under normal SpO2 monitoring load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup routine:\u003c\/strong\u003e\n    After installing this battery, let the Nonin 8500 complete its full power-on self-test without interruption. The device runs a BMS verification step at boot — cutting power during this sequence can register a false battery fault that persists 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 Nonin 8500 shows a low battery alert on a freshly charged replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 8500's BMS uses a voltage threshold calibrated to a conditioned Ni-MH cell. A brand-new cell often sits just below that threshold on its first cycle because the plates haven't reached full charge acceptance yet. The device interprets this as a weak battery and triggers the alert. Run one complete charge-discharge cycle before relying on the battery in a clinical setting — after that cycle, the BMS reads the cell correctly and the alert clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNonin 8500 won't power on after the replacement cell sat unused in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge during storage. If the cell voltage drops below approximately 5.4V, the Nonin 8500's BMS will not initiate startup — it treats deeply discharged cells as a fault condition rather than attempting recovery. Place the battery on charge for a full cycle before attempting to power the device. If the charge indicator shows activity, the cell is recovering; let it complete the full charge before inserting it into the 8500.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381396111450,"sku":"BWCS-NAT850MD-1","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381396144218,"sku":"BWCS-NAT850MD-2","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381396176986,"sku":"BWCS-NAT850MD-3","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NAT850MD_1.webp?v=1778900564","url":"https:\/\/batteryweb.com\/products\/nonin-8500-replacement-battery-6v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}