About this replacement
Ulefone Paris Lite / Be Touch Series — 3.7V Li-ion Replacement Battery (29-1100-000-00)
This is a 3.7V, 1950mAh Li-ion replacement battery for the Ulefone Paris Lite, Be Touch, Be Touch 2, and Be Touch 3 smartphones. It matches OEM part number 29-1100-000-00. Install it when the original cell no longer holds charge through a full day of use or fails to power the phone at all.
- Paris Lite and Be Touch platform compatibility: These four models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — 81.02 x 60.00 x 4.82mm cell with a matched protection circuit. One part number covers all four.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench and confirmed the BMS communicates correctly with the charge IC. Protection thresholds triggered at expected cutoff voltages — no false trips, no runaway charging.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC on these Ulefone models calibrates its coulomb counter against the cell's discharge curve on that first cycle. Running fast charge before calibration completes pushes high current into an uncalibrated cell and skews percentage readings for weeks.
Sudden shutdown at 20–30% on the Paris Lite after a cell swap
The Paris Lite reads remaining charge using a coulomb counter that was tuned to the discharge curve of the original aged cell. A new cell has a steeper voltage drop at the bottom of its charge curve than the worn cell the firmware expects. When screen brightness and modem load spike simultaneously, the new cell's voltage dips below the emergency cutoff threshold — even though the OS gauge still shows 25%. This is a fuel gauge calibration gap, not a cell fault. Run two full discharge-charge cycles without fast charging and the cutoff behaviour will normalise as the IC maps the new cell's actual curve.
Phone won't power on after the replacement battery sat in storage
Li-ion cells self-discharge in storage. If this battery has been stored for several months, its resting voltage may have dropped below 2.5V per cell — the threshold at which the BMS enters lockout mode to prevent damage. The phone will show no sign of life and may not respond to a charger. Connect a known-good USB cable and charger and leave it for 20–30 minutes without pressing the power button. Most BMS circuits on these Ulefone models will accept a trickle current and recover from lockout once the cell climbs back above 2.8V, at which point normal charging resumes.