{"product_id":"simolio-sm-823-replacement-battery-37v-300mah-li-polymer","title":"Simolio SM-823 Wireless Headset Compatible Battery 3.7V 300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSimolio SM-823 Series — 3.7V Li-Polymer Replacement Battery (SM-001BAT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 300mAh lithium-polymer replacement battery for the Simolio SM-823 wireless headset range. It fits the SM-823, SM-823D, SM-8245, SM-863D, and six additional models in the same family. Swap it in when the original cell no longer holds a charge or the headset dies sooner than expected.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSM-823 family fit:\u003c\/strong\u003e\n    All listed models share the same voltage rail, physical cell dimensions (40.00 × 21.70 × 5.80mm), and BMS handshake protocol — that is why one part number covers the full range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the SM-823 base station and confirmed the BMS completed its handshake correctly. The headset registered as charging and the base station showed no error codes after the first full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for DECT headsets:\u003c\/strong\u003e\n    Seat the headset in the base station and let it complete one uninterrupted charge cycle before taking a call. The base needs to log the new cell before its talk-time counter reads accurately — skipping this step causes the indicator to under-report remaining charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SM-823 cuts out mid-call on a new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SM-823 draws current from two simultaneous loads — the audio driver and the DECT radio transmitter. Under combined draw, a cell sitting at storage voltage (typically around 3.6–3.7V, not fully charged) cannot sustain the instantaneous current spike. The BMS interprets this as a low-cell event and trips the cutoff. One full charge cycle from the base station before first use brings the cell to its actual rated capacity and prevents this trip.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station shows full charge but headset cuts off after a few seconds\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a storage-voltage symptom, not a faulty cell. A new lithium-polymer cell ships at roughly 50% charge to stay within safe transport voltage limits. If the base station's charge indicator reads full before the cell has actually completed a cycle, the firmware has not recalibrated to the new cell's capacity. Place the headset back in the base, leave it for a complete uninterrupted charge, then test again. The cutoff threshold for this cell is 3.0V — anything above that after a full cycle means the cell is functioning correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428101193818,"sku":"BWCS-SML823SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428101226586,"sku":"BWCS-SML823SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428101259354,"sku":"BWCS-SML823SL-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SML823SL-1.webp?v=1779934133","url":"https:\/\/batteryweb.com\/products\/simolio-sm-823-replacement-battery-37v-300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}