{"product_id":"bbk-vivo-s1-replacement-battery-37v-1200mah-li-ion","title":"BBK VIVO S1 Replacement Battery BK-B-45 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBBK VIVO S1 \/ V2 \/ S6 — 3.7V Li-ion Replacement Battery (BK-B-45)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion cell built to the BK-B-45 specification. It fits the VIVO S1, VIVO V2, and VIVO S6 smartphones. Swap it when the original cell no longer holds a usable charge through a normal day.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVIVO S1, V2, and S6 compatibility:\u003c\/strong\u003e\n    All three models share the same battery bay geometry, connector pinout, and BMS handshake protocol — which is why a single BK-B-45 cell covers the full trio without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge-discharge cycles on a VIVO S1 unit and confirmed the BMS accepted the cell, reported state-of-charge correctly after one full cycle, and did not trigger a high-temperature cutoff during a standard 5V\/1A charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC shipped in these phones calibrates its coulomb counter against the cell's actual discharge curve — pushing high current into an uncalibrated cell skews percentage readings for weeks.\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 a fresh BK-B-45 cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a steeper voltage drop-off curve near the bottom of its charge range than a worn cell does. The VIVO's fuel gauge IC is still calibrated to the old cell's curve, so it reads 25% when the real terminal voltage is already near the BMS low-voltage cutoff. Under the load spike from the modem or display, voltage dips below the cutoff threshold and the phone shuts down. One full discharge-charge cycle — without fast charging — resets the coulomb counter and moves the shutdown point back down where it belongs.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone will not power on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage, and a BK-B-45 cell stored for several months can drop below 2.5V per cell — the point at which the BMS locks out all charge current as a safety measure. The phone shows nothing when plugged in because the BMS is blocking current before it can reach the charging IC. Connect the phone to a 5V\/1A charger — not a fast charger — and leave it undisturbed for 20–30 minutes. Most BMS circuits include a trickle-recovery path that accepts a small pre-charge current at this voltage, which lifts the cell above the lockout threshold and allows normal charging to resume.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404312838234,"sku":"BWCS-BKV200SL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404312871002,"sku":"BWCS-BKV200SL-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404312903770,"sku":"BWCS-BKV200SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKV200SL-1.webp?v=1779369679","url":"https:\/\/batteryweb.com\/products\/bbk-vivo-s1-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}