TCL 50 LE Replacement Battery TLP038GA 3.87V 3850mAh

TCL 50 LE / T510SP — 3.87V Li-Polymer Replacement Battery (TLP038GA)

This is a 3850mAh Li-Polymer cell at 3.87V, replacing the TLP038GA battery in the TCL 50 LE and T510SP smartphones. It fits directly into either model and restores full power to calling, display, and data functions. Capacity figure is taken from the product specification — 14.9Wh nominal.

• 50 LE and T510SP compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — a single TLP038GA cell services either unit without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a TCL 50 LE unit. The BMS accepted the new cell on first connection, initialised charge current correctly, and reported cell voltage accurately through the system UI.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one complete reference cycle against the new cell's discharge curve before fast charge current is applied.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC is still using the old cell's stored discharge curve. When the phone reads 25%, the new cell may already be near its actual low-voltage floor. Under screen or modem load, voltage drops below the system cutoff before the percentage reaches zero. One full discharge-to-shutdown and uninterrupted recharge cycle writes a new reference curve to the coulomb counter. After that cycle, percentage figures align with actual cell state.

USB fast charge not triggering after battery replacement

On first connection after a cell swap, the charge IC may default to standard 5V/0.5A until it completes a handshake with the new BMS. Some TCL units require the phone to complete one boot cycle with the battery at above 10% before the fast charge protocol re-engages. If fast charge still does not trigger, clear the cached battery stats in recovery mode, then reconnect the original charger. The handshake completes once the BMS confirms cell impedance is within the expected window — typically after the first full charge cycle.