Wiko Tommy 3 K600 Replacement Battery 3.8V 2500mAh

Wiko Tommy 3 — 3.8V Li-ion Replacement Battery (K600)

This is a 3.8V, 2500mAh Li-ion replacement battery for the Wiko Tommy 3 smartphone. It carries OEM part number K600 and slots directly into the Tommy 3's battery bay. Capacity figure is taken from the product specification — 9.5Wh total energy.

• Tommy 3 and K600 fit group: Both the Tommy 3 handset and the K600 part reference share the same 3.8V nominal cell voltage and connector pinout. The BMS handshake between this cell and the Tommy 3's charge IC is matched to that voltage rail — swapping to any other voltage cell trips the protection circuit.
• Bench tested on actual hardware: We cycled this cell through a full discharge and charge sequence on the Tommy 3 platform. The BMS held protection thresholds correctly, and the charge IC accepted the cell without fault flags on the second full cycle after the fuel gauge IC completed its initial recalibration pass.
• First-cycle fuel gauge reset on the Tommy 3: After fitting this replacement, disable fast charging in settings and run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the Tommy 3's fuel gauge IC one clean cycle against the new cell's discharge curve before high-current charging begins.

Why the Tommy 3 reports wrong battery percentage after a cell swap

The Tommy 3 uses a coulomb counter inside the fuel gauge IC to track charge state. That counter is calibrated to the discharge curve of the original cell. When a new K600 cell goes in, the stored curve no longer matches the actual cell chemistry, so the percentage reading drifts — sometimes reading 80% while the phone is minutes from shutdown. One full discharge-to-shutdown followed by a full uninterrupted charge re-anchors the coulomb counter to the replacement cell's actual curve. After that cycle, percentage reporting stabilises.

Sudden shutdown at 20–30% on the replacement K600 cell

This happens when the cell voltage drops sharply under screen or modem load — a voltage cliff the fuel gauge IC hasn't mapped yet on the new cell. The phone's protection circuit sees voltage fall below the cutoff threshold and shuts down before the displayed percentage reaches zero. It is not a faulty cell. Run the Tommy 3 through two full discharge-charge cycles without fast charge enabled. After calibration, the fuel gauge IC adjusts its cutoff prediction and sudden shutdowns at 20–30% stop. Confirm the cell is holding above 3.5V at rest after a full charge before ruling out a deeper fault.