About this replacement
Huawei Honor 50 SE — 3.87V Li-Polymer Replacement Battery (HB426493EFW)
This is a 3900mAh lithium-polymer cell rated at 3.87V, built to replace the original HB426493EFW battery in the Honor 50 SE, Honor 50 SE 5G, and JLH-AN00. It fits the same form factor at 91.30 × 63.50 × 4.00mm and connects to the same flex connector on the motherboard. If your current cell swells, drains fast, or drops off suddenly under load, this swap brings capacity back to spec.
- Honor 50 SE / JLH-AN00 platform fit: All three fit models share the same battery bay geometry, flex connector pitch, and BMS communication line. The fuel gauge IC on this platform reads cell impedance on the first charge cycle, so no hardware modification is needed — the connector seats and the gauge begins learning the new cell immediately.
- Bench tested on actual hardware: We ran this cell on the JLH-AN00 board and confirmed the BMS handshake completed without fault codes. Charge current ramped correctly through CC and CV phases, and the fuel gauge IC registered the new cell's discharge curve within the first full cycle.
- First-cycle fast-charge protocol: After installing this cell, disable fast charging in Settings for the first complete discharge-charge cycle. The fuel gauge IC needs to map the new cell's discharge curve before Huawei's high-current charging protocol pushes elevated current into an uncalibrated cell — skipping this step can produce erratic percentage readings for the first week.
Why the Honor 50 SE reports wrong battery percentage after a cell swap
The Honor 50 SE uses a coulomb counter tied to a fuel gauge IC that builds its percentage model from the original cell's charge and discharge history. When you swap the cell, that learned curve no longer matches the new cell's actual voltage-to-capacity relationship. The IC keeps using the old model until it sees at least one complete discharge-to-charge cycle on the new cell. Run the phone down to auto-shutdown, then charge uninterrupted to 100% — after that single cycle, percentage accuracy returns to normal.
Sudden shutdown at 20–30% on a replacement cell
This happens when the cell voltage drops below what the modem or display rail requires under peak load, even though the fuel gauge still shows charge remaining. A new cell with an uncalibrated gauge will hit this voltage cliff earlier than expected — the IC doesn't yet know where the cell's true low-voltage knee sits. The BMS triggers a protective cutoff before the gauge catches up, so the phone shuts down mid-use. Complete two full discharge-charge cycles and the fuel gauge will place the cutoff threshold accurately, typically resolving shutdowns above 3.5V per cell.