{"product_id":"asus-zenfone-4-pf400cg-replacement-battery-37v-1150mah-li-ion","title":"Asus ZenFone 4 PF400CG Replacement Battery C11P1404 3.7V 1150mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus ZenFone 4 PF400CG \/ A400CG — 3.7V Li-ion Replacement Battery (C11P1404)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1150mAh Li-ion cell built to the C11P1404 specification for the Asus ZenFone 4 PF400CG and A400CG. It replaces the original battery when the phone no longer holds a charge, shuts down unexpectedly, or won't power on at all. Voltage and capacity match the original cell exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePF400CG and A400CG compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The C11P1404 part number covers both variants — one cell fits either board 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 and discharge cycles on a ZenFone 4 board. The BMS accepted the cell without fault flags, and the fuel gauge IC tracked state-of-charge correctly after one full calibration cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging and run one complete discharge down to automatic shutdown, then charge to 100% uninterrupted. This lets the fuel gauge IC map its reference curve to the new cell before high-current charging begins on an uncalibrated state-of-charge reading.\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 ZenFone 4 after a cell swap\u003c\/h3\u003e\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 response under modem and screen load, so the phone hits the low-voltage cutoff threshold earlier than the percentage readout predicts. The phone reports 25% but the cell voltage has already dropped below the safe floor under load. One full discharge-charge cycle forces the coulomb counter to relearn the new cell's curve and eliminates the early cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If voltage has dropped below approximately 2.5V per cell, the BMS enters a lockout state and refuses to allow charge current through. The phone shows nothing on screen — no charging animation, no logo. Connect to a charger and leave it for 15–20 minutes without pressing the power button; the charge IC will trickle current into the cell at a reduced rate until voltage recovers above the BMS re-enable threshold, typically around 3.0V, at which point normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392109445210,"sku":"BWCS-AZF410SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392109477978,"sku":"BWCS-AZF410SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392109510746,"sku":"BWCS-AZF410SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AZF410SL-1.webp?v=1779143796","url":"https:\/\/batteryweb.com\/products\/asus-zenfone-4-pf400cg-replacement-battery-37v-1150mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}