{"product_id":"nonin-capnocheck-plus-replacement-battery-6v-5000mah-ni-mh","title":"Nonin AS35108 Capnocheck Plus Replacement Battery 6V 5000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNonin Capnocheck Plus \/ 9400 Series — 6V Ni-MH Replacement Battery (AS35108)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V 5000mAh Ni-MH replacement battery for the Nonin Capnocheck Plus, 9400, and Sleep CO2 Monitor. These portable capnography monitors use this cell pack to power continuous end-tidal CO₂ measurement during clinical procedures. Capacity matches the OEM specification at 30Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCapnocheck Plus \/ 9400 \/ Sleep CO2 platform fit:\u003c\/strong\u003e\n    All three models share the same 6V rail, AS35108 connector pinout, and BMS handshake protocol. The charge IC in each device is calibrated to the Ni-MH chemistry voltage curve, so the cell chemistry here must match — Li-ion substitutes will fail the internal self-test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through full charge-discharge on the 9400 platform. The BMS accepted the cell on first insertion and completed the startup verification sequence without fault. Capacity delivery tracked within 3% of the 5000mAh rating by cycle two.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eStartup self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the Capnocheck to complete its full power-on self-test without interruption. The device runs a BMS verification routine at boot. Cutting power mid-sequence logs a battery fault that persists until the next clean reboot — it is not a cell defect.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Capnocheck Plus alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Capnocheck's charge IC uses a delta-V termination curve tuned to the original OEM cell's internal resistance profile. A new replacement cell has a slightly different resistance signature during the first charge cycle, which can cause the IC to terminate early and report a partial charge. The BMS then reads the pack as below its low-battery threshold at startup. Run one full charge-discharge cycle before clinical deployment — by cycle two, the IC correctly maps the cell's voltage curve and the alarm clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice not powering on after battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 20–30% per month unprotected. If this pack has sat in a warehouse or drawer, cell voltage may have dropped below the Capnocheck's BMS recovery threshold — typically around 4.8V for a 6V pack. The BMS will refuse to boot rather than draw from a deeply discharged cell, which is a protection behaviour, not a fault. Place the battery in the device and connect to mains charge for a minimum of 15 minutes before attempting power-on; most BMS circuits re-initialise once cell voltage climbs back above 5.4V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381491761242,"sku":"BWCS-BCM522MD-1","price":80.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381491794010,"sku":"BWCS-BCM522MD-2","price":93.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381491826778,"sku":"BWCS-BCM522MD-3","price":103.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BCM522MD-1.webp?v=1778901248","url":"https:\/\/batteryweb.com\/products\/nonin-capnocheck-plus-replacement-battery-6v-5000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}