About this replacement
Honor 80 SE — 3.89V Li-Polymer Replacement Battery (HB486492EGW)
This is a 3.89V, 4700mAh (18.28Wh) Li-Polymer cell for the Honor 80 SE smartphone. It replaces the OEM battery HB486492EGW when the original has lost capacity or no longer holds a charge. Dimensions are 90.30 × 63.30 × 4.80mm — verify against your existing cell before fitting.
- Honor 80 SE fitment: The 80 SE uses a specific connector orientation and BMS handshake tied to the HB486492EGW part number. Fitting an incorrect cell — even one with the same voltage — can trigger charge IC errors or prevent the device from booting.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Honor 80 SE platform. The BMS accepted the cell without error flags, and the charge IC stepped through CC/CV phases normally across multiple cycles.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This allows the fuel gauge IC to recalibrate its coulomb counter against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.
Sudden shutdown at 20–30% on the Honor 80 SE after a cell swap
This happens because the fuel gauge IC is still running the discharge curve of the old, degraded cell. A new cell has a steeper voltage cliff under load — the modem or screen draws a current spike, voltage drops below the shutdown threshold, and the phone cuts out even though the percentage display still reads high. The fix is one full uninterrupted discharge-to-shutdown followed by a full charge with fast charging off. After that cycle, the coulomb counter has a fresh reference curve and percentage readings stabilise.
Honor 80 SE won't power on after sitting in storage with a flat battery
Li-Polymer cells that self-discharge below approximately 2.5V per cell trigger BMS lockout — the protection circuit opens to prevent further discharge damage, and the phone appears completely dead. Plug into a charger and leave it for 15–20 minutes before attempting to power on; the charge IC needs to trickle enough current into the cell to bring it above the BMS re-enable threshold. If the device still does not respond, try a different cable and a wall adapter rated at least 5V/1A — USB ports on computers often cannot deliver enough current to wake a deeply discharged cell. Once the phone boots, complete a full charge cycle before normal use.