About this replacement
Wiko U Feel Go / P4661AN — 3.8V Li-Polymer Replacement Battery (TLE17K22)
This 3.8V, 3800mAh Li-Polymer battery replaces the original TLE17K22 cell in the Wiko U Feel Go and P4661AN smartphones. It fits the 5-inch mid-range handset directly, restoring full power capacity to a device suffering from a worn or failed original cell. Capacity is rated at 14.44Wh.
- U Feel Go and P4661AN compatibility: Both model numbers reference the same hardware platform — identical battery bay dimensions (81.10 × 60.80 × 4.60mm), the same 3.8V nominal rail, and the same connector pinout. One cell covers both.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the U Feel Go platform. The BMS accepted the cell without error flags, charge current ramped correctly through CC/CV phases, and the protection circuit tripped at expected over-voltage thresholds.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard current. The fuel gauge IC on the U Feel Go is calibrated to the original cell's discharge curve — a slow first cycle lets it remap against the new cell before fast-charge currents are applied.
Sudden shutdown at 20–30% on a fresh TLE17K22 replacement
This is a fuel gauge IC mismatch, not a faulty cell. The coulomb counter in the U Feel Go retains the discharge curve from the old, degraded cell. When the new cell's actual voltage drops under modem or display load, the IC predicts more capacity remaining than exists — then hits the voltage cliff and cuts power instantly. One full discharge cycle from 100% to automatic shutdown, followed by an uninterrupted charge to 100%, forces the IC to relearn the new curve. After that cycle, percentage readings stabilise and early shutdowns stop.
Phone warm near the battery bay during the first few charges
A new Li-Polymer cell has higher internal impedance than a cell that has been through several cycles. The charge IC delivers the same current profile it would to a broken-in cell, which generates more heat across a higher-impedance load during those first cycles. This is normal and typically resolves by the third or fourth full charge. If the device becomes hot — not just warm — above 45°C, stop charging and check that the USB cable and charger output match the original spec (5V/1A or 5V/2A depending on charger used).