Google Pixel 4a 5G G025E Replacement Battery 3.87V 3800mAh

Google Pixel 4a 5G — 3.87V Li-Polymer Replacement Battery (G025E-B)

This is a 3.87V, 3800mAh (14.71Wh) lithium-polymer battery that replaces the G025E-B cell inside the Google Pixel 4a 5G. It fits models G025E, G025H, G6QU3, and GD1YQ — all regional variants of the same handset sharing identical battery dimensions and connector. Drop it in when the original cell no longer holds charge through a normal day.

• G025E, G025H, G6QU3, GD1YQ compatibility: These are regional SKUs for the same Pixel 4a 5G hardware. Google uses the same 103 × 45 × 4.5mm cell across all variants with a shared BMS connector and voltage rail — one part number covers all four.
• Bench tested on actual hardware: We cycled this cell through full charge-discharge runs on the Pixel 4a 5G. The BMS accepted the cell without a charge-reject flag, and the coulomb counter tracked capacity from 100% down without dropping the charge-complete signal early.
• Fuel gauge recalibration after swap: 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 charge IC pushes high-current fast charging into an uncalibrated cell.

Sudden shutdown at 20–30% on the Pixel 4a 5G after a cell swap

The Pixel 4a 5G runs a Snapdragon X52 modem alongside a 90Hz display — both pull hard current spikes simultaneously. If the fuel gauge IC hasn't calibrated to the new cell's discharge curve, it misreads the remaining capacity. When the modem and display spike together, the cell voltage dips below the BMS cutoff threshold even though the gauge still shows 25–30%. The fix is one full, uninterrupted discharge-charge cycle with the screen and mobile data active — let the coulomb counter log the actual curve. After that cycle, shutdowns at false-low percentages stop.

USB-PD fast charge not activating after replacement

On the first charge after installation, some units show standard 5V/0.9A charging rather than the expected 18W USB-PD rate. The charge IC performs a handshake check against the new cell's BMS on first contact — if internal resistance reads outside the expected window for a fully depleted cell, it holds at base voltage as a precaution. Charge the phone to 100% at standard rate first, then disconnect and reconnect the charger. The charge IC re-initiates the USB-PD negotiation against a full cell and fast charging resumes. If it still doesn't engage, confirm the charger outputs at least 9V/2A.