Honor Magic 5 HB496789EHW Replacement Battery 3.9V 5000mAh

Honor Magic 5 — 3.9V Li-Polymer Replacement Battery (HB496789EHW)

This is a 5000mAh, 3.9V Li-Polymer cell sourced as a direct replacement for the Honor Magic 5 smartphone. It replaces the OEM battery HB496789EHW when the original cell can no longer hold charge or causes unexpected shutdowns. Capacity is rated at 19.5Wh and dimensions match the original at 87.30 × 66.30 × 5.00mm.

• Magic 5 fitment: The Magic 5 uses a dedicated battery bay sized to the HB496789EHW footprint. This cell matches that exact footprint, connector pitch, and BMS handshake protocol required by the Honor charge IC — no physical modification needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Magic 5 platform and confirmed the BMS accepted the cell on first connection, charge termination triggered correctly at full voltage, and the protection circuit tripped as expected under overload conditions.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard rate. This allows the fuel gauge IC to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on the Magic 5 after a cell swap

A new Li-Polymer cell has a slightly different voltage-versus-capacity curve than the aged OEM cell the fuel gauge IC was trained on. Under high-load events — screen at peak brightness, 5G modem active, or GPS running — the cell voltage can sag below the shutdown threshold while the OS still reports 20–30% remaining. The phone interprets that voltage drop as a critically low cell and cuts power immediately. One full slow-charge cycle lets the coulomb counter recalibrate its internal model against the new cell's actual discharge curve, and the shutdowns typically stop after that cycle.

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

The Honor Magic 5 uses a proprietary fast-charge protocol that requires a handshake between the charge IC and the battery BMS. On a freshly installed cell, the BMS may not complete that handshake until it has completed at least one standard charge cycle. If fast charge does not activate, plug in using the original Honor charger and let the phone charge to 100% at the standard rate without interrupting it. After that first full cycle, reconnect the charger — the fast-charge negotiation should complete and charging current should step up to its rated level.