Google Nexus 6 Replacement Battery 3.8V 3200mAh

Google Nexus 6 — 3.8V Li-Polymer 3200mAh Replacement Battery

This is a 3.8V, 3200mAh Li-Polymer replacement battery for the Google Nexus 6 smartphone. It fits the 2014 Motorola-made Nexus 6 (XT1100/XT1103) and restores power when the original cell can no longer hold a usable charge. Capacity is 3200mAh — matching the factory spec.

• Nexus 6 fit note: The XT1100 and XT1103 variants share the same battery bay dimensions and connector orientation. This cell measures 106.26 × 71.41 × 3.05mm — within the tolerances the frame was built around. The flex connector seats the same way as the original.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the Nexus 6 platform. The BMS accepted charge handshake without error, voltage held steady under screen-on and modem load, and the fuel gauge IC tracked state-of-charge without intervention.
• First-cycle fuel gauge reset: After fitting this battery, disable fast charging and run one complete discharge down to auto-shutdown, then charge to 100% on standard 5V/1A. This gives the Nexus 6 fuel gauge IC a clean discharge curve to calibrate against before higher current charging begins.

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

The Nexus 6 uses a coulomb-counter fuel gauge that retains calibration data from the previous cell. When a new cell with a different internal resistance goes in, the old discharge curve no longer maps accurately to the new cell's actual voltage drop. Under heavy load — screen at full brightness, LTE active, or GPS running — the cell voltage dips faster than the gauge predicts. The phone hits the hardware low-voltage cutoff before the OS percentage reaches zero. One full discharge-charge cycle rewrites the calibration data and eliminates most of these early shutdowns.

Phone won't power on after the replacement battery sat in storage

Li-Polymer cells self-discharge in storage. If the voltage drops below roughly 2.5V per cell, the BMS trips a deep-discharge lockout and blocks normal charge current to protect the cell. The Nexus 6 will show no charge indicator and won't boot. Connect to a wall adapter — not a PC USB port — and leave it untouched for 20–30 minutes. The charge IC trickle-charges at a low rate to bring the cell above the BMS recovery threshold, after which normal charging resumes. If the phone still shows no response after 45 minutes on a wall adapter, the cell voltage has dropped too far for recovery.