About this replacement
Wiko Y61 / Y62 Series — 3.8V Li-ion Replacement Battery (K560)
This is a 3.8V, 2800mAh Li-ion replacement battery for the Wiko Y61, Y62, and Y62 Plus smartphones. It carries OEM part number K560 and fits the W-K560 board variant as well. Install it when the original cell no longer holds a usable charge or the phone shuts down unexpectedly under load.
- Y61, Y62, and Y62 Plus compatibility: All three models share the same K560 cell footprint, connector pinout, and 3.8V nominal voltage rail. The BMS handshake parameters are identical across the range, so one replacement cell covers the full family without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Y61 unit. The BMS accepted the cell without a fault code, and the charge IC stepped through constant-current and constant-voltage phases correctly at the 4.35V upper cutoff.
- Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete 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 points — skipping this step causes erratic percentage readings for the first several days.
Why the Y61 reports wrong battery percentage after a cell swap
The Wiko Y61 uses a fuel gauge IC that builds its state-of-charge model against the original cell's discharge curve. When a new K560 cell goes in, the IC still references the old curve — so the percentage shown can be off by 10–20% in either direction. The fix is one full uninterrupted discharge to the phone's low-battery cutoff, followed by a full charge without interruption. After that cycle, the coulomb counter resets its baseline against the new cell and percentage reporting stabilises.
Sudden shutdown at 20–30% charge remaining
This is a voltage cliff failure, not a capacity problem. Under modem transmit bursts or screen-on load, the cell voltage drops sharply in the 3.6–3.7V range — enough to trigger the BMS undervoltage cutoff even though the displayed percentage still looks safe. It happens most often on cells that have aged past 80% capacity or on a new cell whose fuel gauge hasn't calibrated yet. Run one full discharge-charge cycle first; if shutdowns continue below 3.65V under load, the original cell has degraded past recovery and the K560 replacement is the correct next step.