{"product_id":"envitec-1001844-replacement-battery-37v-2600mah-li-ion","title":"Envitec 1001734 Medical Device Replacement Battery 3.7V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEnvitec MySign S \/ MySign O O2 Meter — 3.7V Li-ion Replacement Battery (1001734)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2600mAh Li-ion cell replaces OEM part 1001734 in the Envitec 1001844, MySign O O2 Meter, and MySign S portable pulse oximeters. It matches the original voltage rail and connector footprint. Capacity is drawn from the product spec sheet — 9.62Wh total energy.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMySign S and MySign O platform fit:\u003c\/strong\u003e\n    Both devices share the same 3.7V single-cell architecture, BMS handshake protocol, and connector pinout — which is why one cell covers the full range. The BMS expects a flat discharge curve consistent with Li-ion chemistry; substituting a different chemistry type will trigger a false low-battery fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and load on a MySign-series unit. The BMS accepted the cell without flagging a fault, completed the charge-termination handshake at 4.2V, and held the load through a full discharge sweep without tripping the protection circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap power-on sequence:\u003c\/strong\u003e\n    After fitting this cell, let the device complete its full power-on self-test without interruption. MySign-series devices run a BMS verification check at startup — cutting power during that sequence locks in 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 after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMySign-series units run a BMS learn cycle during the first few charge-discharge sequences on a new cell. Until that cycle completes, the device may stall mid-boot or report an error state it wouldn't show on a conditioned OEM cell. This is a firmware-level response to an unrecognised charge profile, not a fault with the cell itself. Run one full charge to 4.2V, then allow a full discharge under normal use before treating any boot error as a hardware fault.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator not reaching 100% on first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge cycle, the MySign charge IC applies a conservative current limit to an unrecognised cell — this causes the indicator to plateau below 100% and stay there. The cell is not defective; the charge controller is running a cautious first-pass profile. Disconnect, power the device on fully, let it run down, then recharge from below 3.5V. The second charge cycle typically reaches full termination voltage without issue.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381357641818,"sku":"BWCS-MYS300SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381357674586,"sku":"BWCS-MYS300SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381357707354,"sku":"BWCS-MYS300SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MYS300SL-1.webp?v=1778900214","url":"https:\/\/batteryweb.com\/products\/envitec-1001844-replacement-battery-37v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}