Mobiado Professional 105 Damascus 3.7V Compatible Battery 750mAh

Mobiado Professional 105 Damascus — 3.7V Li-ion Replacement Battery

This is a 3.7V 750mAh Li-ion replacement cell for the Mobiado Professional 105 Damascus and related 105-series handsets. It fits the Professional 105CLB, 105EM, and 105GCB among others sharing the same battery bay. Dimensions are 38.02 × 38.00 × 5.65mm — verify these against your existing cell before fitting.

• 105-series platform fit: The Professional 105 line shares a common battery footprint across its variants. Same voltage rail, same connector orientation, same BMS handshake requirements — one cell covers the full 105 range listed in the compatibility data.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on 105-series hardware. The BMS accepted charge normally, voltage held steady at load, and cutoff thresholds triggered as expected at both ends of the discharge curve.
• Fuel gauge recalibration on first cycle: On first use after installation, disable any fast-charge option for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging runs into an uncalibrated state estimation.

Why the Professional 105 reports wrong battery percentage after a cell swap

The fuel gauge IC in the 105-series stores a learned discharge curve from the original cell. When you fit a new cell, that stored curve no longer matches real-world voltage behaviour. The OS reads an estimated state of charge from a model calibrated to a degraded or differently-aged cell, so percentages appear inflated or deflated. One full discharge to automatic shutdown followed by a full uninterrupted charge resets the coulomb counter and brings the gauge back in line.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem or display load threshold faster than the fuel gauge predicts — a voltage cliff the IC wasn't expecting. At 750mAh, the 105's cell is small, and transient current draw from radio activity or screen-on events can pull voltage down sharply. The BMS trips the output before the percentage counter reaches zero. Run one full calibration cycle and the IC adjusts its cutoff model; if shutdowns persist below 3.2V under load, the cell needs inspection.