TLiB5AA Alcatel OT-995 Replacement Battery 3.7V 1750mAh

Alcatel OT-995 Series — 3.7V Li-ion Replacement Battery (TLiB5AA)

This is a 3.7V, 1750mAh Li-ion cell that replaces the original battery in the Alcatel OT-995, OT-995 Ultra, One Touch 995, and OT-993D. It matches the OEM voltage and physical footprint, so the rear cover seats correctly after installation. Capacity is 6.48Wh — identical to the factory spec.

• OT-995 and OT-993D platform fit: These models share the same battery bay dimensions (64.60 × 43.95 × 5.10mm), connector pinout, and 3.7V nominal voltage rail. The BMS handshake is consistent across the OT-995, OT-995 Ultra, and One Touch 995, so one cell covers all variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on OT-995 hardware. The BMS accepted charge from the device's onboard charge IC without fault flags, and protection circuits tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration after swap: On first use, disable any fast-charge accessory and run one full discharge-to-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging pushes into an uncalibrated state.

Why the OT-995 reports wrong battery percentage after a cell swap

The OT-995 uses a fuel gauge IC that tracks charge state by counting current in and out of the cell — a process called coulomb counting. When a new cell goes in, the IC still holds calibration data from the old, degraded cell. That mismatch causes the percentage display to read high or low relative to actual charge state. One complete discharge cycle from 100% down to automatic shutoff, followed by a full charge, forces the IC to rebuild its reference table against the new cell's real capacity.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display draws a current spike the cell's internal resistance can't sustain — voltage dips below the BMS cutoff threshold even though the reported percentage looks safe. It's a voltage-cliff event, not a capacity problem. After the fuel gauge IC completes one full calibration cycle, the reported percentage will track more closely to the actual voltage curve, and early shutdowns typically stop. If shutdowns continue past two full cycles, check that the battery contacts on the device are clean and making firm contact.