Alcatel 3 TLp029D1 Replacement Battery 3.8V 2800mAh

Alcatel 3 / OT5052D Series — 3.8V Li-Polymer Replacement Battery (TLp029D1)

This is a 3.8V, 2800mAh Li-Polymer cell for the Alcatel 3, OT5052D, One Touch 3 Dual Sim, and compatible models listed below. It fits where the original TLp029D1 sits, matching the connector, dimensions (70.60 × 57.50 × 4.00mm), and BMS communication protocol. Capacity figure is from the cell spec sheet — 10.64Wh at rated voltage.

• Multi-model fitment on the Alcatel 3 platform: The OT5052D, One Touch 3 Dual Sim, and related variants share the same battery bay geometry and 3.8V power rail. The TLp029D1 part number is common across all of them — same connector housing, same BMS handshake signal expected by the charge IC.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on an Alcatel 3 unit. The BMS accepted the new cell without fault codes, and the charge IC stepped through trickle, CC, and CV phases cleanly. No thermal events or premature cutoff during initial cycles.
• Fuel gauge recalibration after install: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — preventing false percentage readings from the first charge onwards.

Sudden shutdown at 20–30% on the Alcatel 3 after a cell swap

This is a voltage cliff issue, not a capacity fault. Under peak modem load or screen-on draw, the new cell's resting voltage drops faster than the fuel gauge IC predicts — because the gauge is still mapped to the old cell's discharge curve. The phone interprets the voltage sag as a hard low-voltage event and shuts down before the displayed percentage hits zero. One full discharge-to-charge cycle recalibrates the coulomb counter and maps the new cell's curve correctly.

USB fast charge not activating on first cycle after replacement

After fitting a new cell, the charge IC may default to standard 5V/1A input and refuse to negotiate the faster charge profile. This happens because the BMS on the new cell starts in a conservative state until it logs a complete charge cycle and confirms thermal and voltage behaviour is within spec. Plug in via a standard charger for the first full cycle — do not use a fast charger for that initial run. After one complete cycle, the charge IC will accept the higher-current profile on subsequent charges.