TLP025C1 Alcatel One Touch Pop 4+ Replacement Battery 3.8V 2500mAh

Alcatel One Touch Pop 4+ — 3.8V Li-Polymer Replacement Battery (TLP025C1)

This 3.8V, 2500mAh (9.5Wh) lithium-polymer cell replaces the original TLP025C1 / TLP025C2 battery in the Alcatel One Touch Pop 4+ and One Touch Allure. It fits the OT-5056D and all One Touch Pop 4 Plus variants sharing the same battery bay. Dimensions are 91.70 × 42.50 × 3.80mm — measure your original before ordering if you are unsure of your exact variant.

• Pop 4+ and Allure compatibility: These models share the same battery footprint, connector pinout, and BMS communication protocol. The TLP025C1 and TLP025C2 part numbers are interchangeable across this group — Alcatel revised the part number mid-production without changing the electrical spec or physical format.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Pop 4+ unit. The BMS handshake completed without error on first insertion, and the charge IC accepted a standard 5V input without entering fault mode. Cell voltage at full charge measured 4.35V — within the Li-Polymer ceiling for this platform.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. The fuel gauge IC on the Pop 4+ is calibrated to the discharge curve of the original cell — giving it one full cycle at low current lets the coulomb counter reset its reference before high-current charging begins.

Why the Pop 4+ reports wrong battery percentage after a cell swap

The Pop 4+ uses a coulomb counter inside the fuel gauge IC to track remaining capacity. That counter builds its model against the original cell's discharge curve over hundreds of cycles. A new cell has a different internal resistance and a slightly different voltage-to-capacity curve, so the IC's stored model no longer maps correctly. The phone may show 100% while still on charge, or drop to 15% with no warning. One full discharge below 5% followed by a slow charge to 100% forces the IC to rewrite its reference curve against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display ramps current draw and the cell voltage sags below the BMS cutoff threshold — even though the reported percentage looks safe. It is not a faulty battery. The fuel gauge IC fired a shutdown percentage that was correct for the old, degraded cell, not the new one. After two or three full discharge-charge cycles, the IC recalculates the voltage cliff and the early shutdowns stop. If shutdowns continue past cycle three, check that resting cell voltage reads above 3.7V on a multimeter before inserting.