Google Nexus 6P Compatible Battery HB416683ECW 3.8V 3450mAh

Google Nexus 6P — 3.8V Li-Polymer Replacement Battery (HB416683ECW)

The HB416683ECW is a 3.8V Li-Polymer cell rated at 3450mAh (13.11Wh), sized to fit the Google Nexus 6P, Nexus 6P A1, and Nexus 6P A2. It replaces the original Huawei-manufactured cell when capacity fade, sudden shutdowns, or failure to hold charge make the phone unreliable. Physical dimensions are 80.05 × 65.80 × 3.96mm — matching the factory tray without modification.

• Nexus 6P, A1, and A2 compatibility: All three Nexus 6P variants share the same battery tray geometry, connector pinout, and BMS handshake protocol. One cell fits all three because Google and Huawei held the same voltage rail and connector spec across the entire 6P line.
• Bench tested on actual hardware: We ran this cell in a Nexus 6P and monitored the BMS through charge and discharge cycles. The protection circuit responded correctly to overvoltage and cutoff events, and the fuel gauge IC accepted the cell without error flags.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes into an uncalibrated coulomb counter — preventing erratic percentage readings from the first charge onward.

Why the Nexus 6P reports wrong battery percentage after a cell swap

The Nexus 6P uses a coulomb counter and a stored discharge curve to calculate the percentage shown on screen. When you replace the cell, the fuel gauge IC is still referencing the old, degraded cell's curve. The result is percentage readings that jump, stall, or fail to track actual charge. One full discharge to auto-shutdown followed by a slow charge to 100% forces the IC to rebuild its reference curve against the new cell.

Sudden shutdown at 20–30% remaining on the replacement cell

This is a voltage cliff issue, not a capacity problem. Under high-current load — modem transmit, GPU burst, or screen at full brightness — the cell voltage drops sharply below the BMS cutoff threshold even though the reported percentage still looks safe. The phone cuts power to protect the cell. Run that first slow recalibration cycle, and if shutdowns continue, check that screen brightness and background sync are not compounding the load during the calibration period. After calibration, the fuel gauge IC tracks the real voltage floor of the new cell and adjusts the shutdown trigger accordingly.