TLi016A9 TCL J630T Replacement Battery 3.7V 1600mAh

TCL J630T / J600T — 3.7V Li-ion Replacement Battery (TLi016A9)

This is a 3.7V, 1600mAh Li-ion replacement battery for the TCL J630T and J600T smartphones. It fits the OEM battery slot directly and uses the same TLi016A9 cell specification as the original. If your device shuts down unexpectedly, won't hold a charge, or won't power on, this is the cell to replace.

• J630T and J600T compatibility: Both models run the same mainboard voltage rail and share an identical battery bay footprint — 58.30 × 51.00 × 5.04mm. The BMS connector pinout matches across the J600T and J630T, so the same cell works in both without adapter or modification.
• Bench tested on actual hardware: We cycled this battery through charge and discharge on a J630T unit. The BMS accepted the cell without error flags, charge current stepped down correctly at 4.2V, and the fuel gauge IC registered capacity without needing a manual reset.
• Fuel gauge recalibration on first cycle: After installing this cell, disable fast charging and run one full discharge-to-charge cycle at standard current. The fuel gauge IC on these TCL devices calibrates its coulomb counter against the actual discharge curve — skipping this step with fast charging active pushes current into an uncalibrated cell and can leave percentage reporting inaccurate for weeks.

Why the J630T reports wrong battery percentage after a cell swap

The J630T uses a fuel gauge IC that stores a discharge curve profile built up from the old cell's history. When a new cell goes in, that stored profile no longer matches the actual cell chemistry, so the percentage readout drifts. The IC needs one complete discharge-charge cycle at standard current to rewrite its reference curve. Until that cycle completes, readings of 5–15% off are normal. After one full cycle, the percentage should stabilise and track accurately.

Sudden shutdown at 20–30% charge remaining

This is a voltage cliff failure — the cell voltage drops sharply under modem transmission or screen-on load before the fuel gauge sees a low-battery state. It happens when the cell impedance is high, either from a worn original battery or from an uncalibrated replacement. Check the shutdown voltage by charging fully, then running the screen at full brightness with mobile data active — if the phone cuts out above 3.4V per cell, the fuel gauge IC hasn't finished calibrating. Run two full discharge-charge cycles at standard (non-fast) charging before drawing high current loads.