HB476489EFW Honor Nova 9 Replacement Battery 3.87V 4200mAh

Honor Nova 9 / Honor 50 / Nova 60 SE — 3.87V Li-Polymer Replacement Battery (HB476489EFW)

This is a 3.87V, 4200mAh (16.25Wh) Li-Polymer cell built to the HB476489EFW specification. It fits the Honor Nova 9, Honor 50, and Nova 60 SE. Swap it in when your original cell no longer holds a charge or drops off sharply under load.

• Nova 9, Honor 50, and Nova 60 SE compatibility: All three models share the same physical footprint, connector pinout, and BMS handshake protocol. The HB476489EFW part number covers the full group — one cell fits all three without modification.
• Bench tested on actual hardware: We cycled this cell through charge and load sequences on the Nova 9 platform. The BMS accepted the handshake cleanly, voltage held steady under sustained screen-on load, and the charge IC reported state-of-charge without error flags.
• 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 high-current charging pushes current into an uncalibrated cell, preventing erratic percentage readings from the first day.

Sudden shutdown at 20–30% on the replacement cell

A new cell with an uncalibrated fuel gauge IC will show a percentage based on the old cell's discharge curve. When the modem fires or the screen peaks in brightness, current draw spikes sharply. If the IC hasn't mapped the new cell yet, it misreads available capacity and the hardware undervoltage cutoff trips before the displayed percentage reaches zero. This is a calibration gap, not a defective cell. Run two full discharge-charge cycles without fast charging — by the second cycle, the coulomb counter has enough data to track the new cell accurately.

USB-PD fast charge not working on first cycle after replacement

On the first charge after a cell swap, the charge IC may refuse to negotiate fast-charge protocols until it completes an initial trickle phase with the new cell. The BMS presents higher impedance on a fresh cell, and some Honor charge controllers default to standard 5V/1A until impedance drops into the expected window. Plug in using the original Honor charger and cable — third-party USB-PD adapters that skip the proprietary handshake will stay locked at standard rate indefinitely. After one full standard-rate cycle, fast charging resumes on the second charge.