About this replacement
Google Pixel 6 Pro — 3.85V Li-Polymer Replacement Battery (G63QN)
This 3.85V, 4900mAh Li-Polymer battery replaces the OEM cell in the Google Pixel 6 Pro (model numbers G8VOU, GLUOG, GF5KQ). It fits the original battery bay and connector without modification. Capacity matches the factory spec at 18.87Wh.
- Pixel 6 Pro model variants (G8VOU, GLUOG, GF5KQ): These three model numbers share the same battery bay dimensions, connector pinout, and BMS handshake protocol — all three accept the G63QN cell without a firmware conflict.
- Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a Pixel 6 Pro unit. The BMS accepted the cell, charge IC engaged correctly, and the fuel gauge IC tracked state-of-charge without error flags in Android's battery stats.
- First-cycle fuel gauge recalibration: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current charging pushes additional load into an uncalibrated state-of-charge reading.
Sudden shutdown at 20–30% on the Pixel 6 Pro after a cell swap
The Pixel 6 Pro's Tensor G1 SoC draws significant current bursts during 5G modem activity and display refresh. A new cell with an uncalibrated fuel gauge IC can report 25% remaining while the actual open-circuit voltage is already near the low-voltage cutoff threshold. When the modem fires a transmit burst, the instantaneous voltage drop trips the BMS protection circuit and the phone cuts out. One full discharge-to-shutdown followed by an uninterrupted charge to 100% gives the coulomb counter enough data to map the new cell's voltage curve accurately.
USB-PD fast charging not engaging on the first cycle after replacement
On initial power-up with a new G63QN cell, the Pixel 6 Pro's charge IC may default to slow 5W charging rather than negotiating the USB-PD fast charge profile. This happens because the BMS on a fresh cell starts with a conservative current limit until it completes one handshake cycle with the phone's charge controller. Plug into the original Google 30W charger — not a third-party adapter — for the first charge. After that first full cycle, USB-PD negotiation should engage and the charging indicator in Settings will show fast charge active.