{"product_id":"koobee-s3-replacement-battery-38v-2000mah-li-ion","title":"BL-61CT KOOBEE S3 Replacement Battery 3.8V 2000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKOOBEE S3 \/ S100 \/ M100 — 3.8V Li-ion Replacement Battery (BL-61CT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2000mAh Li-ion battery rated at 7.6Wh, carrying OEM part number BL-61CT. It fits the KOOBEE S3, S100, and M100 smartphones. These three models share the same battery bay dimensions and connector, so one cell covers all three.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS3, S100, and M100 compatibility:\u003c\/strong\u003e\n    All three models use the same physical footprint — 75.43 × 54.94 × 3.95 mm — the same flex connector pinout, and the same BMS handshake protocol. One replacement cell works across the entire range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran BL-61CT cells through charge and discharge cycles on compatible hardware. The BMS accepted the cell without triggering fault flags, and the charge IC brought voltage up from rest to full-charge termination without cutoff interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current charging pushes current into an uncalibrated state register.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the BL-61CT replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAn aged original cell loses capacity gradually, and the fuel gauge IC calibrates its percentage readings to that degraded curve. When a fresh 2000mAh cell goes in, the IC still references the old curve. Under modem transmission or screen-on load, the phone hits a voltage cliff the IC did not anticipate and cuts power. One full uninterrupted discharge-to-shutdown followed by a full charge corrects the coulomb counter reference. After that cycle, shutdowns at 20–30% should stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice will not power on after BL-61CT sat discharged in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells discharged below 2.5V per cell trigger a BMS lockout — the protection circuit opens and the phone sees no voltage at all. Plugging in a standard charger does nothing because the charge IC needs a minimum rail voltage to start. Connect to a wall adapter rated at 5V\/1A and leave it for 15–20 minutes without pressing the power button — the charge IC will trickle current through the BMS lockout threshold. Once cell voltage recovers above 2.7V, the BMS resets and normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392109740122,"sku":"BWCS-KBM100SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392109772890,"sku":"BWCS-KBM100SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392109805658,"sku":"BWCS-KBM100SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KBM100SL-1.webp?v=1779143797","url":"https:\/\/batteryweb.com\/products\/koobee-s3-replacement-battery-38v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}