Google Pixel 3.85V Replacement Battery 35H00262-00M

Google Pixel / Nexus S1 — 3.85V Li-Polymer Replacement Battery (35H00262-00M)

This is a 3.85V, 2700mAh (10.4Wh) lithium-polymer cell replacing OEM part 35H00262-00M. It fits the Google Pixel, B2PW4100, Nexus S1, and Nexus S1 Global TD-LTE. Install it when the original cell no longer holds charge or causes unexpected shutdowns.

• Pixel / Nexus S1 platform fit: These models share the same 3.85V cell footprint, connector pinout, and BMS handshake protocol. One cell covers the full compatibility group without modification.
• Bench tested on actual hardware: We cycled this cell on a Pixel unit and monitored BMS communication through each charge phase. The protection circuit held cutoff correctly at both ends of the voltage window, and charge termination triggered cleanly at full capacity.
• Fuel gauge recalibration on first use: 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 coulomb counter locks in its reference points.

Sudden shutdown at 20–30% on a replacement cell

A fresh cell has a slightly different voltage-versus-capacity curve than the aged cell it replaces. The fuel gauge IC carries over calibration data from the old cell, so it misjudges how much usable charge remains. When the modem fires or the screen peaks, the cell voltage dips below the BMS cutoff threshold even though the reported percentage looks safe. One full discharge to auto-off followed by an uninterrupted charge to 100% forces the coulomb counter to recalculate against the actual cell curve. After that cycle, shutdowns below 20% stop.

USB-PD fast charge not accepted on first cycle after swap

After a cell swap, the charge IC sometimes falls back to standard 5V charging on the first cycle. The BMS on the new cell has not yet completed its initial handshake with the Pixel's power delivery controller, so the phone does not negotiate the higher voltage tier. Plug in using the original Google charger and cable — third-party cables with high-resistance connectors can prevent the PD contract from forming. Once the first full charge completes, fast charging resumes normally on subsequent cycles.