HB486486ECW Huawei Mate 20 Pro Replacement Battery 3.85V 4100mAh

Huawei Mate 20 Pro / P30 Pro — 3.85V Li-Polymer Replacement Battery (HB486486ECW)

This is a 3.85V, 4100mAh (15.79Wh) Li-Polymer cell built to OEM part number HB486486ECW. It fits the Mate 20 Pro, Mate 20 RS, P30 Pro, LYA-TL00, and over fifteen additional Huawei models that share the same connector and BMS handshake. Dimensions are 83.68 × 63.15 × 4.50mm — verify against your original cell before installation.

• Mate 20 Pro / P30 Pro platform compatibility: These models share the HB486486ECW cell because they run the same Kirin 980 voltage rail, use the same four-pin connector, and require the same BMS authentication sequence the charge IC expects on boot. A different cell without the correct IC signature will not negotiate fast charging.
• Bench tested on actual hardware: We cycled this cell through full charge-discharge on a Mate 20 Pro unit. The BMS accepted the cell handshake without fault codes, and the charge IC held the correct 4.40V upper cutoff throughout — no premature cutoff, no thermal event during the CC-CV transition.
• First-cycle fuel gauge reset: After installation, disable fast charging and run one complete discharge down to automatic shutdown, then charge fully on standard 5V. This gives the fuel gauge IC one clean discharge curve to calibrate against the new cell before high-current charging introduces variable coulomb counts.

Why the Mate 20 Pro reports wrong battery percentage after a cell swap

The Mate 20 Pro uses a coulomb-counter fuel gauge IC that tracks charge state against a stored discharge curve from the original cell. When you install a new cell, that stored curve no longer matches the actual voltage-versus-capacity profile of the replacement. The OS reads a mapped percentage from stale data, so the indicator can read 40% while the real cell voltage is already near the low-voltage cutoff. One full discharge-to-shutdown followed by a full charge resets the coulomb counter and writes a fresh reference curve — after that cycle, percentage readings stabilise.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff problem, not a capacity problem. Under high-load conditions — 5G modem transmit bursts or sustained screen brightness — the cell's internal resistance causes a sharp voltage sag that drops below the BMS low-voltage cutoff before the fuel gauge registers a low percentage. It happens most often before the fuel gauge IC has completed its first full calibration cycle. Run the phone through one complete discharge-to-shutdown on standard charging, and verify the cell resting voltage reads at least 3.85V before continuing normal use.