Honor X50i 5G Replacement Battery HB416594EGW 3.87V 4400mAh

Honor X50i 5G (CRT-AN00) — 3.87V Li-Polymer Replacement Battery (HB416594EGW)

This is a 3.87V, 4400mAh Li-Polymer replacement battery for the Honor X50i 5G smartphone (model CRT-AN00). It replaces the original HB416594EGW cell when the existing battery no longer holds charge or shuts the phone down unexpectedly. Capacity is 4400mAh (17.03Wh), matching the factory specification.

• X50i 5G and CRT-AN00 fit: Both model references share the same physical cell footprint (92.80 × 63.70 × 4.00mm), the same flex connector pinout, and the same BMS handshake voltage threshold — one cell covers both designations without modification.
• Bench tested on actual hardware: We ran the HB416594EGW cell through charge and discharge cycles on the CRT-AN00 board. The BMS accepted the cell on first insertion, charge IC engaged at the correct 4.40V cutoff, and the fuel gauge IC began tracking coulomb count from cycle one.
• First-cycle fuel gauge recalibration: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's actual discharge curve before high-current charging pushes current into an uncalibrated state.

Why the X50i 5G reports wrong battery percentage after a cell swap

The fuel gauge IC on the CRT-AN00 board stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the real voltage-to-capacity relationship of the replacement. The phone reads voltage, maps it against the old curve, and outputs an incorrect percentage — often showing full charge when the cell is at 80%, or dropping suddenly near 20%. One complete discharge cycle (down to automatic shutdown) followed by a full charge resets the coulomb counter and forces the IC to relearn against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff, not a capacity failure. Under combined modem and display load, the cell voltage drops faster than the fuel gauge predicts — the board sees voltage fall below the 3.40V protection threshold and cuts power before the percentage reaches zero. It happens most often when the fuel gauge IC has not yet completed one full calibration cycle on the new cell. Run one full discharge to automatic shutdown, then charge uninterrupted to 100% without fast charging enabled. After that cycle, the gauge tracks the real voltage curve and the shutdowns stop.