Doogee Y100 Replacement Battery 3.8V 2000mAh Li-ion

Doogee Y100 / Valencia 2 Series — 3.8V Li-ion Replacement Battery (Y100)

This is a 3.8V, 2000mAh Li-ion cell for the Doogee Y100, Y100 Pro, and Valencia 2 smartphones. It slots directly into the original battery bay and connects to the same BMS contact points. Capacity is 2000mAh (7.6Wh), matching the factory spec.

• Y100, Y100 Pro, and Valencia 2 compatibility: All three models share the same 3.8V single-cell architecture and identical connector pinout. The BMS handshake protocol is consistent across the range, so one cell covers the full group without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Y100 platform. The onboard charge IC accepted the cell without fault flags, and the BMS held cutoff voltage correctly at both ends of the discharge curve.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging pushes current into an uncalibrated state.

Why the Y100 reports wrong battery percentage after a cell swap

The fuel gauge IC on the Y100 builds its percentage model from a learned discharge curve stored from the previous cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry and impedance. The IC reads voltage correctly but maps it to the wrong state-of-charge point. One complete discharge to automatic shutdown followed by a full charge corrects the internal coulomb counter and restores accurate reporting.

Sudden shutdown at 20–30% remaining on the new cell

This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. At 20–30% indicated, the new cell may already be at or below the voltage threshold the modem and display require under load. The BMS then trips the output to protect the cell, even though the displayed percentage looks safe. Run one full calibration cycle as described above — after that, the gauge will cut off the display reading before the cell hits the trip voltage.