{"product_id":"acare-pulse-oximeter-ah-mx-replacement-battery-37v-1700mah-li-ion","title":"Acare Pulse Oximeter AH-MX Compatible Battery LB-03 3.7V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAcare Pulse Oximeter AH-MX — 3.7V Li-ion Replacement Battery (LB-03)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1700mAh Li-ion replacement battery for the Acare AH-MX pulse oximeter. It fits the AH-MX fingertip unit, which measures blood oxygen saturation and heart rate at the point of care. OEM part number LB-03 confirms direct fitment — no modification needed.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAH-MX platform fitment:\u003c\/strong\u003e\n    The AH-MX runs a single-cell 3.7V Li-ion rail with a BMS handshake tied to the LB-03 cell chemistry. Substituting a different cell type or nominal voltage causes the device to reject the battery or report a false fault on boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the AH-MX charge circuit and confirmed the BMS completed its verification sequence. The protection circuit tripped correctly at low-voltage cutoff and accepted a full recharge without error codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, let the AH-MX complete its full power-on self-test without pressing any buttons. Interrupting the startup sequence before the display stabilises can register a false battery fault that persists until the next clean reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAH-MX not completing boot sequence after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AH-MX runs a BMS verification step during startup that checks cell voltage against an OEM chemistry profile. A fresh replacement cell can sit just below the threshold the device expects if it shipped partially discharged. This causes the unit to stall mid-boot or display a battery error before the screen fully initialises. Charge the new battery to full — confirmed by the charge indicator stopping — before the first power-on.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLow battery alarm triggering immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the AH-MX charge IC applies a conservative acceptance window on a new cell during the first cycle. The internal state-of-charge register hasn't yet calibrated to the replacement cell's actual capacity, so the device reads voltage rather than true charge state and alarms early. Run one complete charge-to-discharge-to-charge cycle before clinical use. After that first full cycle, the BMS recalibrates and the alarm threshold tracks correctly against actual charge level.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381479637082,"sku":"BWCS-BLM800MD-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381479669850,"sku":"BWCS-BLM800MD-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381479702618,"sku":"BWCS-BLM800MD-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLM800MD-1.webp?v=1778901170","url":"https:\/\/batteryweb.com\/products\/acare-pulse-oximeter-ah-mx-replacement-battery-37v-1700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}