{"product_id":"google-gec77-replacement-battery-39v-4550mah-li-polymer","title":"Google Pixel 9 Pro XL Compatible Battery 3.9V 4550mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGoogle Pixel 9 Pro XL — 3.9V Li-Polymer Replacement Battery (G949-00975-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.9V, 4550mAh lithium-polymer cell replaces the factory battery in the Google Pixel 9 Pro XL (GEC77) and related Pixel 9 series models including GR83Y and GWVK6. It restores full device operation — calls, apps, camera, and background services. Capacity figures come from product data, not third-party estimates.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePixel 9 series platform fit:\u003c\/strong\u003e\n    The GEC77, GR83Y, and GWVK6 share the same battery bay geometry, connector pinout, and BMS communication protocol. One cell covers the full Pixel 9 lineup using this form factor 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 Pixel 9 hardware. The BMS handshake completed correctly, charge IC accepted the cell without fault codes, and voltage held steady under simultaneous modem and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\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 high-current charging begins.\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 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Pixel 9's fuel gauge IC stores a discharge model calibrated to the original cell. A new cell has a different internal resistance profile, so the IC misreads remaining voltage headroom. When the modem fires a high-current burst or the display ramps brightness, the new cell's voltage dips below the shutdown threshold even though the reported percentage looks safe. One full slow-charge cycle allows the coulomb counter to resync against the actual cell curve and eliminates most of these premature shutdowns.\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 Pixel 9's charge IC sometimes refuses to negotiate USB-PD fast charging on the first cycle. The charge IC performs a safety handshake with the new BMS before unlocking higher current — if the BMS hasn't completed its first full initialisation, the IC falls back to standard 5V charging. Plug in using the standard charger, allow a full charge to 100% without interruption, then reconnect. Fast charge typically activates from the second cycle onward once BMS initialisation is complete.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391779504218,"sku":"BWCS-GPW830SL-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391779536986,"sku":"BWCS-GPW830SL-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391779569754,"sku":"BWCS-GPW830SL-3","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GPW830SL-1.webp?v=1779141908","url":"https:\/\/batteryweb.com\/products\/google-gec77-replacement-battery-39v-4550mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}