Alcatel TLp029B1 Touch Pop 4S Compatible Battery 3.85V 2950mAh

Alcatel Touch Pop 4S / One Touch Pop 4S LTE — 3.85V Li-Polymer Replacement Battery (TLp029B1)

This 3.85V, 2950mAh Li-Polymer cell replaces the OEM battery in the Alcatel Touch Pop 4S and One Touch Pop 4S LTE. It covers OT-5095 and OT-5095Y variants, along with additional OT-5095 sub-models. OEM part numbers TLp029B1 and TLp029B2 both cross-reference to this cell.

• OT-5095 series compatibility: The OT-5095 line shares a single battery bay spec — same connector pitch, same 3.85V nominal rail, and the same BMS handshake used across Touch Pop 4S variants. One cell fits all models in this cluster without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an OT-5095 unit. The BMS accepted charge without fault flags, the fuel gauge IC tracked state-of-charge without erratic jumps, and the protection circuit tripped correctly at low-voltage cutoff.
• Fuel gauge recalibration on first install: After fitting this cell, disable fast charging and run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC a full sweep of the new cell's discharge curve before the coulomb counter locks in its reference points.

Why the OT-5095 reports wrong battery percentage after a cell swap

The OT-5095 uses a fuel gauge IC that builds its charge-remaining model against the original cell's discharge curve. When you swap the cell, the IC still references that old curve. The result is percentage readings that lag reality — often showing 30–40% when the phone is close to shutdown. One full discharge-charge cycle without interruption forces the IC to re-map against the new cell's actual voltage profile. After that cycle, percentage reporting stabilises.

Sudden shutdown at 20–25% on the replacement cell

This happens when the modem or display pulls a current spike that the cell cannot sustain at that state of charge — voltage drops below the BMS cutoff threshold instantly, and the phone shuts off. It is not a faulty battery; it is the fuel gauge IC reporting a state-of-charge that is higher than the cell's actual deliverable capacity at load. The fix is the same recalibration cycle: one full discharge to auto-shutdown and a full uninterrupted charge. If shutdown still occurs after two full cycles, check that the battery connector is fully seated — a partial connection raises contact resistance and amplifies voltage sag under load.