{"product_id":"winner-wg1-replacement-battery-37v-1200mah-li-ion","title":"WINNER WG1 Replacement Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eWINNER WG1 \/ WG8 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion cell for the WINNER WG1 and WG8 smartphones. It replaces the original battery when capacity has degraded and the phone can no longer hold a usable charge. Physical dimensions are 53.00 × 34.00 × 5.70mm — measure your original before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWG1 and WG8 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, voltage rail, and connector pinout, so one cell covers either handset 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 full charge and discharge cycles on the WG1 platform. The BMS accepted the charge profile correctly and protection circuits tripped as expected at low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging begins on an uncalibrated state-of-charge 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 WINNER WG1 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC still holds the discharge curve from the old, degraded cell. The new cell has a steeper voltage cliff under modem or screen load, so the phone hits the hardware undervoltage cutoff well before the OS percentage reaches zero. The phone reads 25% but the cell has already dropped below the safe floor under load. One full discharge-charge cycle with the screen on forces the coulomb counter to relearn the new cell's actual voltage curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage, and if voltage drops below approximately 2.5V per cell, the BMS enters lockout to prevent damage. The phone will show nothing when you press the power button — no boot logo, no charging animation. Connect the phone to a low-current charger (a standard 5V wall adapter, not a fast charger) and leave it for 20–30 minutes before attempting to power on. Once the cell recovers above 3.0V, the BMS re-enables the output rail and the phone will respond normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404283838554,"sku":"BWCS-WKL003SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404283871322,"sku":"BWCS-WKL003SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404283904090,"sku":"BWCS-WKL003SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WKL003SL-1.webp?v=1779369617","url":"https:\/\/batteryweb.com\/products\/winner-wg1-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}