TLp020EC Alcatel One Touch Pop Up Replacement Battery 3.8V 1900mAh

Alcatel One Touch Pop Up / OT-6044 — 3.8V Li-Polymer Replacement Battery (TLp020EC)

This is a 3.8V, 1900mAh Li-Polymer replacement battery for the Alcatel One Touch Pop Up and One Touch Pop Up LTE Dual SIM (OT-6044, OT-6044D). It replaces OEM part number TLp020EC. Fit this battery when the original cell no longer holds charge through a normal day of use.

• OT-6044 and OT-6044D compatibility: Both the standard and Dual SIM variants use the same 3.8V cell with identical connector pinout and BMS handshake — one battery covers both boards without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the OT-6044 board. The BMS accepted the charge IC handshake cleanly, and protection thresholds triggered correctly at both high-voltage cutoff and low-voltage floor.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — skipping this step is the main cause of erratic percentage readings.

Sudden shutdown at 20–30% on the OT-6044 after a cell swap

When the fuel gauge IC is calibrated to the old cell's discharge curve, it misjudges remaining capacity on the new cell. The OT-6044's modem and display draw combined current spikes that cause the new cell's voltage to drop below the BMS cutoff threshold — even though the reported percentage still shows charge remaining. The phone sees a voltage cliff and cuts power to protect the cell. One full discharge-to-shutdown followed by an uninterrupted charge to 100% forces the coulomb counter to reset its reference points against the new cell.

Phone won't power on after the replacement battery sat in storage

Li-Polymer cells self-discharge during storage, and if the TLp020EC cell drops below approximately 2.5V, the BMS enters lockout mode and blocks charge input to prevent thermal runaway on an over-discharged cell. The phone will show no response to the charge cable and will not boot. Connect the phone to a wall adapter — not a USB port — and leave it for 15–20 minutes without pressing the power button. The charge IC applies a trickle current that brings the cell above the BMS re-enable threshold, typically around 2.9V, after which normal charging resumes.