Alcatel OT-995 TLIB5AA Replacement Battery 3.7V 1500mAh

Alcatel OT-995 / OT-995 Ultra — 3.7V Li-ion Replacement Battery (TLIB5AA)

This is a 3.7V, 1500mAh Li-ion cell replacing part numbers TLIB5AA, CAB31Y0006C1, CAB31Y0002C1, BY75, CAB150000SC1, and TliB5AD. It fits the Alcatel OT-995, OT-995 Ultra, One Touch 995, and OT-993D. The cell measures 64.60 × 43.95 × 5.10mm — physically identical to the factory cell on these models.

• OT-995 and OT-993D platform: These models share the same battery bay geometry, connector pinout, and BMS handshake protocol. One cell covers the entire group without modification.
• Bench tested on actual hardware: We cycled this cell through the OT-995 charge IC and confirmed the BMS reported state-of-charge correctly by the second full cycle. Charge termination tripped at the correct cutoff voltage with no overcharge event.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before it reports percentages to the OS — skipping this step causes erratic percentage readings for several days.

Sudden shutdown at 20–30% on the OT-995 after a cell swap

This is a voltage cliff issue, not a capacity problem. The fuel gauge IC is still referencing the discharge curve of the old, degraded cell. When the new cell hits a load spike — modem transmitting or screen at full brightness — the IC misreads remaining capacity and the BMS drops output before the cell is actually depleted. Running two full discharge-charge cycles forces the coulomb counter to recalibrate against the new cell's actual voltage slope. After recalibration, shutdowns at false-low percentages stop.

OT-995 not powering on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If the cell voltage dropped below approximately 2.5V, the BMS enters lockout mode to prevent a damaged charge cycle. The phone will show no response — no boot, no charge indicator. Connect the phone to a wall adapter rather than a PC USB port, which delivers insufficient current to wake the BMS. Leave it connected for 15–20 minutes before attempting to power on; the charge IC will trickle current into the cell until it clears the BMS lockout threshold, typically around 3.0V.