TLi014C7 Alcatel One Touch Pixi First Replacement Battery 3.7V 1400mAh

Alcatel One Touch Pixi First — 3.7V Li-ion Replacement Battery (TLi014C7)

This 3.7V, 1400mAh Li-ion cell replaces the original battery in the Alcatel One Touch Pixi First and its variants — OT-4024, OT-4024D, and OT-4024X. It matches OEM part numbers TLi014C7 and TLP020A2. Capacity is 5.18Wh, consistent with the stock specification for this handset.

• OT-4024 variant fit: The OT-4024, OT-4024D, and OT-4024X share the same battery bay geometry, connector pitch, and BMS handshake protocol — one cell covers all three variants without modification.
• Bench tested on actual hardware: We cycled this cell on an OT-4024 unit and logged the BMS charge termination. The protection circuit tripped correctly at full voltage, and the fuel gauge IC tracked state-of-charge across three full discharge cycles without fault codes.
• First-cycle discharge tip: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle before returning to normal charging settings. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging begins.

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

The OT-4024's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell has a slightly different impedance profile, so the IC can misread remaining voltage headroom. When the modem fires up for a call or the screen brightness peaks, current draw spikes and the cell voltage drops faster than the IC expects. The phone interprets this as a critical low-voltage event and shuts down — even though the percentage readout still shows 20–30%. One full uninterrupted discharge cycle, down to automatic shutdown, followed by a full charge, resets the coulomb counter and clears this behaviour.

Battery percentage jumping erratically on the OT-4024 after replacement

Erratic percentage jumps — say, 45% dropping to 12% then climbing back to 40% — point to a fuel gauge IC that hasn't mapped the new cell's open-circuit voltage curve yet. The IC is interpolating from stale calibration data stored for the old cell. This is not a fault with the replacement cell itself. Charge the phone to 100%, let it discharge fully to auto-shutdown without interruption, then charge back to 100% — that single cycle gives the IC enough data points to anchor its estimates at 3.7V nominal and stop jumping.