Wiko Darkfull TLG13J24 Compatible Battery 3.8V 2000mAh

Wiko Darkfull — 3.8V Li-Polymer Replacement Battery (TLG13J24)

This 3.8V, 2000mAh Li-Polymer battery replaces the OEM TLG13J24 cell in the Wiko Darkfull smartphone. It restores power to devices suffering from rapid discharge, swollen cells, or complete failure to hold charge. Capacity is 2000mAh (7.6Wh) — identical to the original specification.

• Darkfull platform fit: The Darkfull uses a single-cell Li-Polymer pack at 3.8V nominal with a fixed connector pinout. The TLG13J24 form factor — 85.22 × 43.20 × 4.27mm — is specific to this chassis. No other Wiko cell shares this exact footprint and BMS handshake configuration.
• Bench tested on actual hardware: We cycled this cell through charge and load discharge on the Darkfull board. The BMS accepted charge without fault flags, and the protection circuit triggered correctly at low-voltage cutoff — no thermal events, no unexpected trips.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging runs into an uncalibrated coulomb counter.

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

The Darkfull's fuel gauge IC retains the discharge curve from the old cell after replacement. When the new cell's actual voltage drops faster than the stored curve predicts — particularly under modem or display load — the phone shuts down while still reporting capacity remaining. This is a voltage cliff mismatch, not a faulty battery. One full discharge-to-cutoff followed by a complete uninterrupted charge cycle forces the IC to relearn the new cell curve. After that cycle, shutdowns at 20–30% typically stop.

Device won't power on after the replacement battery sat in storage

Li-Polymer cells self-discharge in storage. If the TLG13J24 shipped or was stored at a low state of charge and sat unused, the cell voltage may have dropped below the BMS lockout threshold — typically 2.5V per cell. The BMS enters a protection state and blocks normal boot. Connect the Darkfull to a wall charger — not a USB hub — and leave it for 15–30 minutes before attempting to power on. If the charge IC can push a trickle through the BMS, the cell will recover to a voltage where the protection circuit resets and normal charging resumes.