DOOV D710 Replacement Battery BL-G28 3.7V 1500mAh

DOOV D710 / iEva D710 — 3.7V Li-ion Replacement Battery (BL-G28)

This is a 3.7V, 1500mAh Li-ion replacement cell for the DOOV D710 and iEva D710 smartphones. It matches the OEM BL-G28 specification and fits the original battery bay without modification. Capacity is 5.55Wh, identical to the factory cell.

• D710 and iEva D710 compatibility: Both variants share the same battery bay dimensions, connector pinout, and BMS handshake. The BL-G28 cell at 68.26 × 51.72 × 4.15 mm seats correctly in either chassis without forced fitting or adapter.
• Bench tested on actual hardware: We cycled this cell through charge, standby, and screen-on load. The BMS accepted charging from a standard 5V USB source, held voltage above 3.6V across moderate screen and modem load, and tripped the low-voltage cutoff cleanly at the expected floor.
• First-cycle fuel gauge recalibration: After installation, disable fast charging and run one full discharge-to-charge cycle at standard current. The fuel gauge IC on the D710 calibrates against the cell's discharge curve on that first pass. Skipping this step is the primary reason the percentage readout jumps or reads inaccurately after a cell swap.

Why the D710 shuts down suddenly at 20–30% remaining

The D710's modem and display draw a combined current spike that aged cells cannot sustain. When cell impedance rises, voltage sags below the BMS cutoff threshold even though the fuel gauge still shows charge remaining. A new cell with lower internal resistance holds voltage through those spikes. If sudden shutdowns persist after fitting this cell, run a full recalibration cycle — the coulomb counter may still be referencing the old cell's degraded curve.

Phone feels warm near the battery during the first few charges

A new Li-ion cell arrives with higher internal impedance than a cell that has been cycled. The charge IC on the D710 pushes current into that higher-impedance cell, which converts more energy to heat in the first few cycles. This is normal and typically resolves by the third full cycle as impedance drops. If the phone remains warm past five cycles, check that the charge IC is not running a fast-charge profile — confirm the charging source is a standard 5V/1A adapter, not a fast-charge brick.