{"product_id":"google-gq57s-replacement-battery-389v-4940mah-li-polymer","title":"Google Pixel Watch 2 GQ57S Compatible Battery 3.89V 4940mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGoogle Pixel 9 Pro XL \/ GQ57S — 3.89V Li-Polymer Replacement Battery (G949-01033-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.89V, 4940mAh Li-Polymer battery fits the Google Pixel 9 Pro XL and GQ57S \/ GZC4K variants. It replaces a degraded or failed original cell restoring power to the display, processor, modem, and connectivity stack. Capacity figure is 19.22Wh as measured from product data — not an estimate.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGQ57S and GZC4K platform fit:\u003c\/strong\u003e\n    Both model codes share the same battery bay geometry, connector pinout, and BMS handshake protocol on the Pixel 9 Pro XL platform — the same cell services the voltage rail across all three identifiers without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a Pixel 9 Pro XL unit. The BMS accepted the new cell, completed a full charge cycle without thermal cutoff, and the charge IC reported correct termination voltage at 4.40V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points — skipping this step causes erratic percentage reporting.\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 Pixel 9 Pro XL after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell has a slightly different internal resistance profile than the aged cell the fuel gauge IC was calibrated against. Under high-current loads — 5G modem activity, sustained screen brightness, or simultaneous GPS use — the cell voltage can drop sharply below the BMS cutoff threshold even when the reported percentage still looks safe. The phone reads the voltage cliff as a critical low and shuts down immediately. One full unconstrained discharge-charge cycle resets the coulomb counter reference and resolves this in most cases.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell swap, the charge IC on the Pixel 9 Pro XL runs an initial impedance check on the new cell before negotiating high-current USB-PD protocols. If the cell's internal resistance reads outside the expected window on the first cycle, the IC defaults to standard 5W charging as a protective measure. This is not a fault in the battery or the charger — it is the charge controller behaving correctly with an uncalibrated cell. Complete one full standard-rate charge cycle first, then reconnect a USB-PD charger; fast charge resumes once the IC accepts the cell's resistance profile at 9V \/ 2A or higher.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391779405914,"sku":"BWCS-GPW570SL-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391779438682,"sku":"BWCS-GPW570SL-2","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391779471450,"sku":"BWCS-GPW570SL-3","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GPW570SL-1.webp?v=1779141908","url":"https:\/\/batteryweb.com\/products\/google-gq57s-replacement-battery-389v-4940mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}