About this replacement
Huawei Honor 4A / SCL-L00 — 3.8V Li-Polymer Replacement Battery (HB4342A1RBC)
This is a 3.8V, 2580mAh (9.8Wh) lithium-polymer cell built to OEM part number HB4342A1RBC. It fits the Honor 4A, Honor 4A Dual SIM, SCL-L00, SCL-L03, and over 30 additional SCL-series variants. If the original cell is swelling, dropping charge quickly, or refusing to power on, this is the direct replacement.
- SCL-series platform fit: All Honor 4A variants — single SIM and Dual SIM — use the same battery bay geometry, connector pitch, and BMS handshake. The HB4342A1RBC is the one SKU that covers the full SCL hardware family without modification.
- Bench tested on actual hardware: We cycled this cell on an SCL-L01 unit and confirmed BMS communication, charge acceptance across the full 3.8V nominal range, and cutoff behaviour at both ends of the discharge curve. The protection circuit tripped correctly at low-voltage threshold without requiring a manual reset.
- Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins. Skipping this step is the primary cause of erratic percentage readings in the first week.
Sudden shutdown at 20–30% on the Honor 4A after a cell swap
This is a voltage cliff issue, not a capacity defect. Under peak modem load or screen brightness, the new cell's internal resistance causes a momentary voltage drop that the phone interprets as a dead battery. The PMIC triggers shutdown even though the coulomb counter still shows charge remaining. Running one full discharge-charge cycle without fast charging lets the fuel gauge IC recalibrate and eliminates most of these early shutdowns.
Honor 4A not powering on after the replacement battery sat in storage
Lithium-polymer cells shipped or stored for extended periods can drop below the BMS lockout threshold — typically 2.5V per cell. When that happens, the protection circuit cuts output entirely and the phone shows no response. Connect the phone to a wall charger, not a PC USB port, and leave it for 15–20 minutes without pressing any buttons. Most BMS circuits on this cell will accept a trickle pre-charge recovery above 2.5V and resume normal charging from there.