About this replacement
Google Pixel 7 Pro — 3.85V Li-Polymer Replacement Battery (GMF5Z)
This 3.85V, 4900mAh Li-Polymer battery replaces the GMF5Z cell in the Google Pixel 7 Pro. It fits the original battery slot and connects to the same flex cable and BMS contacts. Install it when the original cell can no longer hold charge or shuts the phone down unexpectedly.
- Pixel 7 Pro cell fit: The Pixel 7 Pro uses a single Li-Polymer pouch cell running a 3.85V nominal rail. The GMF5Z connects via a multi-pin flex that carries both power and BMS communication to the phone's charge IC. Any replacement must match that pin layout and voltage profile exactly — this cell does.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Pixel 7 Pro platform. The BMS handshake completed correctly, the charge IC accepted the cell without flagging a fault, and voltage held stable under display and modem load.
- Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-charge cycle at standard speed. The Pixel 7 Pro's fuel gauge IC calibrates its coulomb counter against the cell's discharge curve. Skipping this step on a new cell causes the OS to report inaccurate percentages for weeks.
Sudden shutdown at 20–30% on the Pixel 7 Pro after a cell swap
This is a voltage cliff issue, not a capacity problem. When the modem fires a high-power transmission burst or the display hits peak brightness, instantaneous current draw spikes hard. If the fuel gauge IC is still calibrated to the old cell's discharge curve, it reads 25% state-of-charge — but the new cell's actual resting voltage under that load drops below the shutdown threshold. The phone cuts out to protect the SoC. One full uncalibrated discharge-charge cycle at standard speed corrects this — after that cycle, the coulomb counter maps to the new cell and the shutdowns stop.
USB-PD fast charge not activating on first cycle after replacement
On the first charge after a cell swap, the Pixel 7 Pro's charge IC may default to trickle or standard rate and refuse to negotiate USB-PD fast charge. This happens because the charge IC runs an internal check against the new cell's impedance — a fresh Li-Polymer pouch reads higher impedance than a cycled cell, and the IC holds back until it confirms the cell is safe to push current into. Plug in using the original Google 30W adapter and leave it connected for a full charge without interrupting the session. After that first complete cycle, USB-PD fast charge negotiation returns to normal.