Honor 100 Pro HB506591EHW Replacement Battery 3.91V 4900mAh

Honor 100 Pro / MAA-AN10 — 3.91V Li-Polymer Replacement Battery (HB506591EHW)

This is a 3.91V, 4900mAh Li-Polymer replacement cell for the Honor 100 Pro (MAA-AN10). It slots into the same position as the original HB506591EHW and restores the phone's full operating capacity. Capacity figures are taken directly from the product specification — 19.16Wh total energy.

• MAA-AN10 platform fit: The 100 Pro and its MAA-AN10 board variant share the same battery connector pinout, BMS handshake protocol, and charge IC configuration. This cell communicates correctly with the fuel gauge IC on both variants without any hardware modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the MAA-AN10 board. The BMS accepted the cell on first insertion, charge current ramped correctly through CC/CV phases, and the protection circuit tripped at the expected over-voltage threshold.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC starts pushing high current into an uncalibrated cell.

Sudden shutdown at 20–30% after fitting a new cell in the Honor 100 Pro

The Honor 100 Pro uses a coulomb counter that was calibrated against the original cell's internal resistance curve. A new cell has different impedance, so the reported state-of-charge diverges from the real voltage faster than the old cell did. Under peak modem or display load, the actual cell voltage drops below the BMS cutoff before the OS percentage reaches zero. The fix is one full uninterrupted discharge from 100% to automatic shutdown, followed by a full charge — this gives the fuel gauge IC enough data to rebuild its reference table. After that cycle, the percentage readout tracks accurately under load.

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

After a cell swap, the charge IC on the Honor 100 Pro sometimes stays in trickle mode for the first connection because the BMS flags the new cell as unverified until it sees a baseline charge cycle complete. This is a BMS protection behaviour — not a fault with the charger or cable. Plug into the original Honor charger and let the first charge run to 100% without interruption. Fast charge negotiation resumes normally from the second cycle onward once the BMS has logged a completed charge event against the new cell.