Google Pixel 9 Pro Fold G576D Replacement Battery 3.87V 4400mAh

Google Pixel 9 Pro Fold — 3.87V Li-Polymer Replacement Battery (G07DF / G949-01097-00)

This 3.87V, 4400mAh Li-Polymer cell replaces the original battery in the Google Pixel 9 Pro Fold (G576D, G6GPR, G8HHN, GKV4X and related variants). It fits the fold's dual-display platform and interfaces directly with the device's charge IC and fuel gauge. Capacity is 4400mAh (17.03Wh), matching the original cell's energy rating.

• Pixel 9 Pro Fold platform fit: These model numbers share the same battery bay dimensions (91.40 × 46.80 × 5.30mm), connector pinout, and BMS handshake protocol — which is why one cell covers all listed variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge, discharge, and fast-charge sequences on the Pixel 9 Pro Fold platform. The BMS accepted USB-PD negotiation correctly and held voltage within spec across the discharge curve with no thermal or cutoff anomalies.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the Pixel 9 Pro Fold after a cell swap

The Pixel 9 Pro Fold runs two displays and a high-frequency modem simultaneously. When those loads spike together, even a new cell must deliver current without dropping below the BMS cutoff voltage — typically 3.0V per cell. If the fuel gauge IC is still calibrated to the old cell's discharge curve, it reports 25% remaining while the actual open-circuit voltage is already near that floor. The phone shuts down because the hardware sees a voltage cliff the software hasn't predicted. One full slow-charge cycle after replacement resets the coulomb counter and resolves this.

USB-PD fast charge not activating on the first cycle after replacement

After a battery swap, the Pixel's charge IC runs a short conditioning pass before it allows the USB-PD handshake to negotiate higher wattage. On the first charge cycle, the phone may stay at standard 5V/1A input even when a PD charger is connected. This is the charge IC protecting an uncalibrated cell, not a fault with the battery or charger. Plug in, let the first cycle complete fully, then reconnect — fast charge will activate on the second cycle once the IC confirms cell health.