TCL VZW-TCL-4056 Replacement Battery 3.8V 1750mAh TLi017C7

TCL VZW-TCL-4056 / Flip Pro — 3.8V Li-ion Replacement Battery (TLi017C7)

This is a 3.8V, 1750mAh (6.65Wh) Li-ion replacement cell for the TCL VZW-TCL-4056, Flip Pro, 4056L, and 4056W. It replaces OEM part TLi017C7 directly. When the original cell degrades and can no longer sustain voltage under screen or modem load, this cell restores normal operation.

• VZW-TCL-4056 / Flip Pro platform fit: The 4056L, 4056W, and Flip Pro variants share the same battery bay dimensions, connector pin-out, and BMS handshake requirements. One cell covers all four models without modification.
• Bench tested on actual hardware: We cycled this cell through the TCL charge IC and confirmed BMS communication, charge termination at 4.35V, and protection cutoff response at the low-voltage threshold. The fuel gauge IC accepted the cell and began tracking state-of-charge within the first full cycle.
• Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. The TCL fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve. Skipping this step causes the OS to display inaccurate percentages for several days.

Sudden shutdown at 20–30% on the TCL Flip Pro after a cell swap

A new cell has a slightly different discharge curve than the worn original. The fuel gauge IC is still calibrated to the old curve, so it misjudges remaining capacity. When the modem or display draws a brief high-current spike, the cell voltage dips below the BMS protection threshold even though the OS shows 20–30% remaining. The phone cuts out as a hard protection event, not a normal shutdown. One full discharge and charge cycle at standard rate — no fast charging — lets the coulomb counter remap to the new cell and eliminates the false cutoff.

Phone warm near the battery compartment on the first few charges

A fresh Li-ion cell has higher internal impedance than a broken-in cell. The charge IC pushes current into that resistance, and the difference is shed as heat. This is normal for the first three to five charge cycles as the cell's internal resistance settles. If the phone stays warm beyond five cycles or the heat concentrates at the USB port rather than the battery area, check that the charge cable is not forcing a high-current fast-charge profile into an uncalibrated cell — switch to a standard 5V/1A charger until the cell is fully broken in.