Doogee HT7 Replacement Battery 3.8V 2200mAh Li-ion

Doogee T7 / Homtom HT7 Series — 3.8V Li-ion Replacement Battery (HT7)

This is a 3.8V, 2200mAh (8.36Wh) Li-ion replacement cell for the Doogee T7, T7 Pro, and Homtom HT7 smartphones. It slots in where the original HT7 battery sits, restoring power to devices that no longer hold a charge or fail to boot. Dimensions are 85.54 × 62.02 × 4.48mm — measure your existing cell before ordering if unsure.

• T7, T7 Pro, and Homtom HT7 compatibility: All three models share the same HT7 cell footprint, connector pinout, and 3.8V nominal voltage rail. The BMS protection circuit is integrated into this cell, so it communicates correctly with the charge IC on each of those boards without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the T7 platform. The BMS tripped correctly at low-voltage cutoff and accepted charge current without thermal events. Capacity read within expected range of the rated 2200mAh.
• First-cycle fuel gauge recalibration: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle before normal use. The fuel gauge IC in the T7 is calibrated to the old cell's discharge curve — one slow cycle lets it re-anchor to the new cell before high-current charging pushes uncalibrated current into the battery.

Why the T7 reports wrong battery percentage after a cell swap

The T7 uses a coulomb-counter fuel gauge IC that builds a discharge model from cycles on the original cell. When you fit a new cell, that stored model no longer matches the actual voltage-versus-capacity curve of the replacement. The phone reads voltage correctly but maps it to the wrong percentage. One full slow discharge from 100% to automatic shutoff, followed by a full charge, forces the IC to rebuild its curve against the new cell. After that cycle, percentage accuracy returns to normal.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem, screen, or both spike current draw and the cell voltage drops sharply — faster than the fuel gauge IC expects at that state of charge. The phone's low-voltage protection cuts the system before the displayed percentage reaches zero. It is not a faulty cell; it is a miscalibrated gauge reading a voltage cliff it was not expecting. Run two full discharge-charge cycles without fast charging and the shutoffs will move progressively lower until they stop.