About this replacement
Wiko Barry / Barry Dual SIM — 3.7V Li-ion Replacement Battery (BARRY)
This 3.7V, 2000mAh Li-ion cell replaces the original battery in the Wiko Barry and Barry Dual SIM smartphones. It matches the OEM part number BARRY and fits both single and dual SIM variants of the handset. Dimensions are 70.00 × 59.90 × 4.40mm — verify your original cell before installing.
- Barry and Barry Dual SIM fit: Both variants run the same 3.7V voltage rail, use the same connector pinout, and share the BARRY part number. The BMS handshake is identical across both — one cell covers both boards.
- Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on the Barry platform. The BMS accepted the cell without error flags, charge IC communicated correctly, and the fuel gauge IC tracked state-of-charge through the full curve.
- First-cycle fast charge protocol: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging is applied to an uncalibrated cell.
Why the Barry reports wrong battery percentage after a cell swap
The fuel gauge IC in the Barry stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads voltage against the old curve and returns an incorrect percentage. One complete discharge down to automatic shutoff, followed by a full charge to 100%, forces the IC to rewrite its reference curve to the new cell.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops sharply under load from the modem or display — a voltage cliff the fuel gauge did not predict. The phone's protection circuit trips before the displayed percentage reaches zero. It is not a faulty cell; it is the gauge IC working from a miscalibrated curve. Run one full discharge-charge cycle and the shutoff point will shift — the gauge recalibrates its cliff detection around the new cell's actual voltage floor, typically near 3.4V under load.