About this replacement
Wiko Highway Signs / Highway Pure — 3.8V Li-Polymer Replacement Battery (TLN14H22)
This 3.8V, 2000mAh Li-Polymer cell replaces the original battery in the Wiko Highway Signs, Highway Signs 3G, and Highway Pure smartphones. It matches the OEM part numbers TLN14H22 and TLE14E20. The 69.30 × 59.00 × 3.40mm footprint fits the original battery bay without modification.
- Highway Signs and Highway Pure compatibility: These three models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers all three variants without adapter or wiring changes.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Highway Signs platform. The BMS accepted the cell on first connection, charge current ramped correctly through CC/CV phases, and the protection circuit tripped at the expected over-discharge floor.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference — skipping this step causes percentage jumps and premature low-battery warnings.
Sudden shutdown at 20–30% on the Wiko Highway Signs after a cell swap
The Highway Signs fuel gauge IC holds a discharge curve from the old, degraded cell. When a fresh cell is installed, the IC underestimates remaining capacity and calls a low-voltage cutoff earlier than the actual cell floor. Under modem or display load, voltage sags briefly below the IC's stored threshold, triggering an immediate shutdown even though usable charge remains. One full discharge to 0% followed by an uninterrupted charge to 100% resets the coulomb counter to the new cell curve — after that cycle, shutdowns at 20–30% stop.
Phone warm near the battery during first charge after replacement
A new Li-Polymer cell has higher internal impedance than a broken-in cell. On the first charge cycle, the charge IC pushes current into higher resistance, which converts more energy to heat than normal. This is expected behaviour and typically resolves after two to three full cycles as the cell conditions. If the phone becomes hot to the touch rather than just warm, or if the charger is above 10W, switch to a standard 5W charger for the first cycle and check that the battery connector is fully seated — a partial connection raises contact resistance and compounds the heating.