{"product_id":"qcore-sapphire-multi-therapy-replacement-battery-74v-1800mah-li-ion","title":"QCore Sapphire Multi-Therapy 7.4V 1800mAh Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eQCore Sapphire Multi-Therapy — 7.4V Li-ion Replacement Battery (LIN337-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 1800mAh lithium-ion battery replaces the original power cell in the QCore Sapphire Multi-Therapy and SapphirePlus portable therapeutic units. It fits OEM part numbers LIN337-001 and 05020-160-0001-BAT. The cell dimensions are 55.96 x 34.12 x 21.40mm, matching the original bay exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSapphire and SapphirePlus platform compatibility:\u003c\/strong\u003e\n    Both the Sapphire Multi-Therapy (15031-000-0001) and SapphirePlus (15038-043-0001) share the same voltage rail, connector pinout, and BMS handshake protocol — one cell covers both platforms without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, load, and self-test sequences. The BMS accepted the cell on first contact, passed the protection circuit checks, and held voltage within the device's operating window under therapeutic load conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After installing this cell, allow the Sapphire to complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup — cutting power during this sequence logs 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\"\u003eQCore Sapphire alarming low battery immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Sapphire's charge IC applies a conservative acceptance threshold calibrated to the OEM cell's existing charge history. A new cell with no cycle history may not satisfy that threshold on the first charge, triggering a low-battery alarm even when the cell is at or near full capacity. The BMS needs one complete charge-discharge cycle to map the new cell's actual capacity curve. Run the device through one full clinical-load discharge down to device cutoff, then recharge fully — the alarm clears once the BMS has a baseline to work from.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice will not power on after the replacement cell sat unused in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-ion cells self-discharge during storage. If this cell has been sitting for several months, its resting voltage may have dropped below the Sapphire's BMS recovery threshold — typically around 6.0V for a 7.4V nominal pack — and the device will refuse to boot. Connect the charger and leave the cell on charge for a minimum of 30 minutes before attempting to power on. If the charge indicator does not respond within that window, the cell voltage is likely below the charger's own recovery floor; try a different compatible charger capable of trickle recovery before drawing any other conclusion.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381472624730,"sku":"BWCS-QRM150MD-1","price":48.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381472657498,"sku":"BWCS-QRM150MD-2","price":56.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381472690266,"sku":"BWCS-QRM150MD-3","price":62.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-QRM150MD-1.webp?v=1778901067","url":"https:\/\/batteryweb.com\/products\/qcore-sapphire-multi-therapy-replacement-battery-74v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}