{"product_id":"myphone-a919i-dual-replacement-battery-37v-1700mah-li-ion","title":"MyPhone A919i Dual Replacement Battery 3.7V 1700mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMyPhone A919i Dual — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1700mAh Li-ion replacement battery for the MyPhone A919i Dual smartphone. It fits directly into the A919i Dual battery compartment and restores power to a phone that no longer holds a charge. Capacity is 6.29Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA919i Dual compatibility:\u003c\/strong\u003e\n    The A919i Dual runs a dual-SIM radio stack, which draws simultaneous current from two baseband modules. This cell matches the voltage rail and physical footprint the phone's charge IC expects — wrong cell impedance here causes erratic shutdowns under dual-SIM load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on a smartphone test rig. The BMS accepted charge current without tripping, held voltage above 3.5V through mid-discharge, and reported state-of-charge to the fuel gauge IC without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before the charge IC applies high-current charging to an uncalibrated cell.\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 A919i Dual after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe A919i Dual's fuel gauge IC retains the discharge curve from the old cell after a swap. When the new cell hits its voltage cliff — typically around 3.55–3.6V under dual-SIM or screen load — the phone cuts out even though the gauge still shows 20–30% remaining. This is a calibration mismatch, not a faulty battery. One full discharge cycle from 100% to auto-shutdown, followed by an uninterrupted charge to 100%, resets the coulomb counter to the new cell's curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage, and if the cell drops below 2.5V the BMS enters lockout to prevent damage — the phone will show nothing when you press the power button. Connect the phone to a wall charger, not a USB port, and leave it for 15–20 minutes before attempting to power on. The charge IC needs enough current to push the cell back above the BMS re-enable threshold, which is typically 2.9–3.0V. Once the phone shows a charging indicator, the BMS has reset and normal charging can resume.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404307791962,"sku":"BWCS-MCT500SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404307824730,"sku":"BWCS-MCT500SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404307857498,"sku":"BWCS-MCT500SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MCT500SL-1.webp?v=1779369735","url":"https:\/\/batteryweb.com\/products\/myphone-a919i-dual-replacement-battery-37v-1700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}