Wiko Darside TLG15G08 Replacement Battery 3.7V 2600mAh

Wiko Darside — 3.7V Li-Polymer Replacement Battery (TLG15G08)

This is a 3.7V, 2600mAh (9.62Wh) Li-Polymer cell for the Wiko Darside and Darkside smartphones. It replaces part number TLG15G08 when the original cell degrades, swells, or stops holding a usable charge. Dimensions are 83.60 × 64.00 × 4.25mm — verify against your original before fitting.

• Darside and Darkside compatibility: Both model names reference the same hardware platform. The connector pinout, cell dimensions, and BMS handshake requirements are identical across both variants, so one part number covers either device.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on the bench. The BMS accepted charge current correctly, hit rated voltage without deviation, and the protection circuit tripped at expected low-voltage cutoff without latching.
• Fuel gauge recalibration on first use: After fitting, disable fast charging and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before higher charge currents are applied to an uncalibrated cell.

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

This is a voltage cliff failure, not a capacity problem. The Darside's modem and display together pull enough current that a fresh cell — before the fuel gauge IC has completed calibration — hits the BMS's low-voltage cutoff threshold while the OS still shows charge remaining. The fuel gauge was calibrated to the old cell's discharge curve and misreads the new cell's voltage-to-capacity relationship under load. Run two full discharge and charge cycles at standard charge rates, and the reported percentage will track actual remaining capacity accurately.

Phone warm near the battery during first charges after replacement

A fresh high-impedance cell generates more heat than a broken-in one during the initial charge cycles. The charge IC on the Darside maintains its target current regardless, so internal resistance across the new cell converts more energy to heat until the cell conditions. This is normal for the first two or three full cycles. If the phone stays warm beyond that point or the case feels hot — above roughly 40°C to the touch — stop charging and check cell seating and connector contact.