Wiko Y82 Compatible Battery K630 3.85V 3000mAh

Wiko Y82 — 3.85V Li-Polymer Replacement Battery (K630)

This is a 3.85V, 3000mAh (11.55Wh) lithium-polymer cell that replaces the original K630 battery in the Wiko Y82 smartphone. It fits the Y82 directly using the original connector and retains BMS communication with the phone's charge IC. Capacity figure is matched to the original specification.

• Wiko Y82 fitment: The Y82 uses a snap-in flat-pack Li-Polymer cell at 81.70 × 62.00 × 5.00mm. This replacement matches those dimensions and the K630 connector pinout, so the fuel gauge IC can read cell state correctly from the first boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Y82 platform. The BMS accepted the handshake without fault codes, and the charge IC ramped current normally through CC/CV stages without thermal interruption.
• First-cycle fuel gauge reset: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the Wiko Y82 after a cell swap

The Y82's fuel gauge IC retains the discharge curve of the old, degraded cell in its coulomb counter. When you install a fresh cell, the IC maps new cell voltage against the old curve — and at around 3.65–3.70V under modem or display load, it hits what it thinks is the cutoff floor. The phone shuts down even though the cell still has usable capacity. Running one complete uninterrupted discharge down to the automatic power-off, then a full charge to 100%, forces the IC to relearn the curve against the new cell. After that cycle, percentage readings stabilise.

Device will not power on after the replacement cell sat in storage

Li-Polymer cells self-discharge in storage, and if the K630 replacement dropped below approximately 2.5V per cell before installation, the BMS enters lockout to prevent damage. The phone will show no response — no charging animation, no vibration. Connect the phone to a wall charger rather than a PC port, which delivers more stable 5V current, and leave it undisturbed for 15–20 minutes. The BMS recovery circuit needs a trickle current to bring cell voltage above the lockout threshold before normal charging can begin. Once the charging animation appears, the BMS has cleared the lockout and the cycle can proceed normally.