Google Pixel 6a Replacement Battery GLU7G 3.85V 4400mAh

Google Pixel 6a — 3.85V Li-Polymer Replacement Battery (GLU7G)

This 3.85V, 4400mAh Li-Polymer battery replaces the original GLU7G cell in the Google Pixel 6a, GB17L, Pixel 6a 5G, and GB62Z. It fits the same physical envelope — 96.30 × 45.00 × 5.50mm — and connects to the same flex connector the factory cell uses. Swap it when the original cell can no longer hold charge or triggers unexpected shutdowns.

• Pixel 6a and GB17L platform fit: These variants share the same battery bay dimensions, flex connector pinout, and BMS handshake protocol. One cell covers all listed models without modification.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a Pixel 6a. The BMS accepted the handshake, charge current ramped correctly, and the device reported capacity without error flags.
• Fuel gauge recalibration on first use: 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 fast charging pushes high current into an uncalibrated state.

Sudden shutdown at 20–30% on the Pixel 6a after a cell swap

The Pixel 6a uses a coulomb-counter-based fuel gauge that builds its state-of-charge model from learned discharge curves. A new cell has a different internal resistance profile than the aged cell the firmware was calibrated to. Under a modem or display load spike, the cell voltage dips faster than the gauge predicts, triggering an emergency cutoff before the reported percentage reaches zero. Run two full discharge and charge cycles without fast charging to let the fuel gauge IC relearn the curve and the shutdowns will stop.

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

After a cell swap, the charge IC on the Pixel 6a defaults to a reduced current limit until it confirms the new cell's BMS is responding correctly. On the first plug-in, this can look like slow charging or no fast-charge indicator at all. This is not a fault — it is a protective handshake. Complete one full standard charge cycle, disconnect, then reconnect to a USB-PD charger and fast charging will re-engage at full rate.