HB496590EFW-F Huawei Honor Play 20 Replacement Battery 3.87V 4900mAh

Huawei Honor Play 20 — 3.87V Li-Polymer Replacement Battery (HB496590EFW-F)

This is a 3.87V, 4900mAh Li-Polymer replacement battery for the Huawei Honor Play 20, also sold as KOZ-AL00 and Changwan 20. It replaces OEM part HB496590EFW-F and fits the same physical cavity at 87.00 x 62.85 x 5.00mm. Use the capacity figure from the product listing — 4900mAh / 18.96Wh.

• Honor Play 20 / KOZ-AL00 / Changwan 20 compatibility: All three model names share the same motherboard platform and battery connector pinout. The BMS handshake uses the same authentication line, so one cell SKU covers all three variants without modification.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a KOZ-AL00 unit. The charge IC accepted the BMS handshake on the first cycle, and the protection circuit tripped correctly at the low-voltage cutoff threshold without triggering a false shutdown above 3.0V per cell.
• First-cycle fast charge handling: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging pushes load into an uncalibrated cell.

Why the Honor Play 20 reports wrong battery percentage after a cell swap

The fuel gauge IC on the KOZ-AL00 platform stores a learned discharge curve from the original cell. After a replacement, the IC still references that old curve, so the percentage reading drifts from actual cell voltage. This shows up as the bar jumping several percent in either direction under normal screen-on load. One full discharge down to automatic shutdown followed by an uninterrupted charge to 100% forces the coulomb counter to rewrite its reference curve against the new cell. Until that cycle completes, percentage readouts are unreliable.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity fault. When the modem is transmitting or the screen is at full brightness, instantaneous current draw spikes and the cell voltage drops faster than the fuel gauge IC tracks. If the resting voltage sits near 3.5V, a brief high-draw event pulls it below the BMS cutoff threshold and the phone shuts off even though the reported percentage looks safe. To confirm the cause, charge the phone to 100%, then check the percentage again after one minute of idle — if it immediately reads lower than expected, the IC recalibration cycle described above has not completed. Run that full discharge-charge cycle first before drawing conclusions about the cell itself.