{"product_id":"biolight-a2-replacement-battery-37v-1800mah-li-ion","title":"Biolight A2 Pulse Oximeter Replacement Battery 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBiolight A2 \/ A3 \/ A4 \/ A5 Series — 3.7V Li-ion Replacement Battery (LB-02)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1800mAh Li-ion replacement battery for the Biolight A2, A3, A4, and A5 pulse oximeters. It fits the compact handheld units used for non-invasive SpO₂ and heart rate monitoring in clinical and portable settings. OEM part numbers LB-02 and 12-100-0001 both cross-reference to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA2–A5 platform fit:\u003c\/strong\u003e\n    The A-series oximeters share a common battery bay, connector pinout, and BMS communication protocol across these models. One cell covers the range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the Biolight A2 power-on self-test sequence and confirmed the BMS handshake completed without fault flags. Charge acceptance and cutoff voltages matched the OEM profile.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After installing this battery, allow the device to complete its full power-on self-test cycle without interruption. The Biolight A-series runs BMS verification at startup — cutting power during this sequence triggers 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\"\u003eDevice not completing boot sequence on new battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Biolight A-series boot sequence includes a BMS learn step that runs in the first few seconds after power-on. A new cell arriving partially discharged from storage can present a voltage slightly below the threshold the firmware expects at that step. The device interprets this as a battery fault and halts the boot. A full charge to 4.2V before first use clears this condition and lets the self-test pass normally.\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 charge IC applies a conservative current limit on a new cell, and the BMS alarm threshold is calibrated against a fully conditioned OEM cell. On the first charge cycle, the new cell's internal resistance reads slightly higher than expected, which the firmware scores as reduced capacity. Run one complete charge-discharge-recharge cycle before clinical use. After that first conditioning cycle, the alarm threshold recalibrates and the false low-battery flag clears.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381476294746,"sku":"BWCS-BLA200MD-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381476327514,"sku":"BWCS-BLA200MD-2","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381476360282,"sku":"BWCS-BLA200MD-3","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLA200MD-1.webp?v=1778901051","url":"https:\/\/batteryweb.com\/products\/biolight-a2-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}