{"product_id":"riester-35v-xl-replacement-battery-37v-3400mah-li-ion","title":"Riester 10691 3.5V XL Replacement Battery 3400mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRiester 3.5V XL Series — 3.7V Li-ion Replacement Battery (10691)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 3400mAh lithium-ion battery replacing OEM part number 10691. It fits Riester 3.5V XL, Led Li-Ion, C Handles, and 3.5 Ri Accu C Type Handle diagnostic instruments — the otoscopes and ophthalmoscopes used in clinical examination. Voltage and capacity match the original cell exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e3.5V XL and C Handle compatibility:\u003c\/strong\u003e\n    These models share a common 3.7V lithium-ion cell format, the same connector pinout, and a BMS handshake that validates cell chemistry at startup. Any cell outside the correct voltage window fails that check immediately.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the Riester power-on self-test sequence. The BMS accepted the cell on first insertion, completed its verification pass, and held charge under the instrument's LED and lamp load without a false-low alarm.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After installing this cell, let the device complete its full power-on self-test without switching it off mid-sequence. Riester instruments run a BMS verification at startup — interrupting it plants 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\"\u003eWhy the Riester XL flags low battery immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Riester BMS stores a capacity baseline from the previous cell and compares it against the new one on first use. A fresh cell that hasn't completed a full charge-discharge cycle doesn't yet match that baseline, so the instrument interprets the delta as a fault. This is not a defective battery. Run one complete charge-discharge cycle before clinical use and the BMS recalibrates to the new cell's actual capacity curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice will not power on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-ion cells self-discharge during storage. If this battery has been sitting unused, its resting voltage may have dropped below the Riester BMS recovery threshold — typically around 2.5V per cell. The instrument won't attempt to wake a cell it reads as critically discharged. Charge the battery in its cradle for at least 30 minutes before trying to power on the device; the charge IC needs to bring the cell above the wake threshold before the BMS will allow a start sequence.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381421539418,"sku":"BWCS-HNM106MX-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381421572186,"sku":"BWCS-HNM106MX-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381421604954,"sku":"BWCS-HNM106MX-3","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HNM106MX-1.webp?v=1778900661","url":"https:\/\/batteryweb.com\/products\/riester-35v-xl-replacement-battery-37v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}