Alcatel One Touch Pixi 7 TLp028AD Replacement Battery 3.8V 2800mAh

Alcatel One Touch Pixi 7 / OT-9006W — 3.8V Li-Polymer Replacement Battery (TLp028AD)

This is a 3.8V, 2800mAh Li-Polymer replacement battery for the Alcatel One Touch Pixi 7 and OT-9006W tablet. It fits where the original TLp028AD, TLp028AC, or TLp034B sits inside the device. Install it when the original cell no longer holds a charge or the tablet fails to power on.

• One Touch Pixi 7 and OT-9006W fit: Both models share the same 3.8V battery bay, connector pinout, and BMS handshake protocol — one cell covers both. No adapter or wiring change needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the OT-9006W platform. The BMS accepted the full charge cycle without flagging an error, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: After installation, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before using the device normally. This gives the fuel gauge IC a complete reference curve against the new cell — skipping this step causes erratic percentage readings for the first several cycles.

Why the Pixi 7 reports wrong battery percentage after a cell swap

The Pixi 7 uses a coulomb-counting fuel gauge IC that builds its charge model from the original cell's discharge curve. Swap the cell and the IC is still running the old model — the numbers it shows no longer match what the new cell is actually doing. This shows up as the percentage jumping around, sticking at a fixed value, or dropping sharply near the end of discharge. One complete reference cycle — full discharge to shutdown, then full charge — overwrites the cached curve and brings the readout back into line.

Sudden shutdown at 20–30% on the replacement cell

This happens when the tablet's screen or modem pulls a current spike the new cell cannot sustain at that state of charge — the cell voltage drops below the BMS cutoff threshold and the device shuts off instantly, even though the percentage indicator said charge remained. It is a voltage-cliff issue, not a capacity defect. The fuel gauge IC's uncalibrated model is reporting a higher state of charge than the cell can deliver under load. Complete one full reference cycle as described above, and the shutdowns will stop once the gauge tracks the actual discharge curve.