Google Nexus One G11 Replacement Battery 3.7V 1350mAh

Google Nexus One G11 — 3.7V Li-ion Replacement Battery (BG32100)

This 3.7V, 1350mAh Li-ion cell replaces the original battery in the Google Nexus One (G11). It fits the single-cell bay and connects via the standard three-contact strip on the board. Capacity matches the factory specification at 1350mAh (5Wh).

• G11 cell bay fitment: The Nexus One uses a single Li-ion cell at 3.7V nominal with a three-pin connector carrying positive, negative, and thermistor signals. This cell matches that pinout and the 65 × 44 × 4.50mm form factor — no modification needed to seat it.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the G11 board. The protection circuit accepted the BMS handshake, charge IC reached full termination voltage without error, and cell voltage held stable under Wi-Fi and display load.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge adapter for the first full discharge-to-charge cycle. This gives the Nexus One's fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

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

A new cell has a slightly different voltage-versus-capacity curve than the aged original. The G11's fuel gauge IC is still calibrated to the old cell, so it misreads remaining charge and cuts power when the voltage drops below what the modem or display can sustain. This is not a fault in the replacement cell — it is the gauge IC running stale data. One complete discharge to auto-off followed by a full uninterrupted charge resets the coulomb counter and clears the phantom shutdown. After that cycle, the phone should not cut out above 3.4V under load.

Nexus One not powering on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If this cell dropped below approximately 2.5V per cell before installation, the onboard BMS enters lockout to prevent damage and the phone will not respond to the power button. Connect the phone to a wall charger — not a computer USB port — and leave it for 15–20 minutes without pressing anything. The charge IC on the Nexus One board will trickle current into the cell until the BMS unlocks, typically above 2.8V, at which point normal charging resumes.