TLp020C1 Alcatel One Touch Idol X Replacement Battery 3.8V 2000mAh

Alcatel One Touch Idol X — 3.8V Li-Polymer Replacement Battery (TLp020C1)

This is a 3.8V, 2000mAh Li-Polymer cell (7.6Wh) that replaces the original battery in the Alcatel One Touch Idol X and One Touch Idol X Dual. It fits OT-6040A, OT-6040E, and more than 22 additional Alcatel Idol X variants sharing the same connector and BMS handshake. Cross-references include TLp020C1, TLp020C2, and CAC2000012C2.

• Idol X family compatibility: The OT-6040A and OT-6040E share the same 3.8V voltage rail, physical footprint (73.75 × 55.46 × 3.52mm), and BMS communication protocol — which is why one cell covers the full Idol X range without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an OT-6040 unit. The BMS accepted the cell on first insertion, protection circuits triggered correctly at low-voltage threshold, and the charge IC handed off cleanly at 4.35V.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after fitting this cell. The fuel gauge IC on the Idol X is calibrated to the original cell's discharge curve — letting it run one full unassisted cycle prevents it from applying the wrong current profile to an uncalibrated cell.

Sudden shutdown at 20–30% on the Idol X after a cell swap

The Idol X fuel gauge IC tracks charge using a coulomb counter mapped to the original cell's internal resistance curve. A new cell has lower impedance, so the voltage-to-capacity curve shifts — the OS reads 25% while the actual cell voltage is already at the modem's cutoff floor. Under the load spike of a 4G transmission or screen-on burst, the cell voltage drops below 3.4V for a fraction of a second, and the device shuts down before the OS can catch it. One full slow-charge cycle lets the coulomb counter re-anchor to the new cell's actual discharge profile.

Device won't power on after sitting in storage with a flat battery

If the original cell discharged below 2.5V during storage, the BMS enters a lockout state to prevent a damaged cell from accepting charge. Swapping in this replacement cell clears that lockout immediately — the new cell ships with a partial charge above the BMS re-initialisation threshold. If the phone still won't respond after fitting the new cell, hold the power button for 12 seconds to force a hard reset, then connect a charger and confirm the charge LED activates within 30 seconds.