About this replacement
Alcatel One Touch Pixi 4 Plus Power — 3.8V Li-Polymer Replacement Battery (TLP050BC)
This 3.8V, 5000mAh lithium-polymer battery replaces the original TLP050BC cell in the Alcatel One Touch Pixi 4 Plus Power and One Touch Pixi 4 Plus Power Dual SIM (5023F). It fits the same footprint at 94.00 × 64.90 × 4.72mm and matches the original connector and BMS handshake points. Capacity is rated at 19Wh from the factory.
- 5023F and Dual SIM compatibility: Both the single and Dual SIM variants of the Pixi 4 Plus Power share the same battery bay dimensions, voltage rail, and connector pinout. The BMS communication line is identical across both board revisions, so this cell seats and negotiates correctly on either model.
- Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on the 5023F mainboard. The BMS negotiated charge termination correctly at 4.35V, and the protection circuit tripped as expected under short-circuit simulation. No anomalous heat at the charge IC contact points.
- Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the Pixi 4's coulomb counter a clean reference cycle against the new cell's discharge curve before fast-charge current is applied to an uncalibrated cell.
Sudden shutdown at 20–30% on the Pixi 4 Plus Power
The Pixi 4 Plus Power runs a combined modem and screen load that can pull current sharply when LTE signal drops. A degraded original cell hits a voltage cliff under that spike — the cell voltage collapses below the BMS cutoff threshold even though the fuel gauge still reads 20–30%. This replacement cell holds voltage more steadily under the same load spike. After fitting it, run the full recalibration cycle so the fuel gauge IC maps the new cell's actual voltage-to-capacity curve and stops triggering premature shutdowns at a falsely high percentage.
Phone won't power on after sitting in storage — BMS lockout
Lithium-polymer cells that discharge below roughly 2.5V in storage trigger the BMS protection circuit, which then blocks normal charging to prevent cell damage. The phone shows no charge indicator and appears completely dead. Connect it to a wall charger — not a PC USB port — and leave it for 20–30 minutes without interrupting the connection. The charge IC delivers a low-current trickle that nudges the cell above the BMS re-enable threshold, typically around 2.9–3.0V, at which point normal charging resumes and the screen responds.