TLiS600 Alcatel One Touch Flash Plus Replacement Battery 3.8V 3300mAh

Alcatel One Touch Flash Plus — 3.8V Li-Polymer Replacement Battery (TLiS600)

This 3.8V, 3300mAh Li-Polymer battery replaces the TLiS600 cell in the Alcatel One Touch Flash Plus (OT-7054, OT-7054T). It fits directly into the original battery bay and connects via the factory connector. Capacity is 3300mAh — 12.54Wh — sourced from the product specification, not estimated.

• OT-7054 and OT-7054T compatibility: Both variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 87.34 × 65.42 × 3.80mm cell envelope fits without modification across both board revisions.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the OT-7054 platform. The BMS accepted charge current without fault, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: After installing this cell, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC on this platform calibrates its coulomb counter against the new cell's discharge curve — skipping this step causes the percentage readout to drift against the actual state of charge.

Sudden shutdown at 20–30% on the One Touch Flash Plus

This is a voltage cliff failure. When the modem transmits or the screen drives high current, the cell voltage drops sharply under load — faster than the fuel gauge IC expects based on its stored curve. The phone's protection circuit reads this as an undervoltage event and cuts power before the percentage reaches zero. On a new replacement cell, this happens most often in the first few cycles because the fuel gauge IC is still running its old calibration map. Run two full discharge-to-zero and charge-to-100% cycles to let the IC remap the curve against the new cell.

OS showing wrong battery percentage after cell swap

The fuel gauge IC on the OT-7054 stores a learned discharge curve from the old cell. After a swap, it applies that old curve to the new cell — so 40% on screen may be 55% actual, or vice versa. The fix is one full discharge cycle from 100% down to automatic shutdown, followed by a full uninterrupted charge to 100%. At that point the coulomb counter resets its reference voltage to 3.8V full charge and begins building a new curve. If the percentage still jumps erratically after two full cycles, check that the battery connector is fully seated — a loose pin causes intermittent voltage readings that confuse the IC.