ZTE G380 Replacement Battery Li3713T42P3h614057 3.7V 1200mAh

ZTE G380 Series — 3.7V Li-ion Replacement Battery (Li3713T42P3h614057)

This is a 3.7V, 1200mAh Li-ion cell that replaces the original battery in the ZTE G380 and compatible models including the J-G380, F165, and F165i. It slots into the same battery bay and uses the same OEM part number Li3713T42P3h614057. Swap it when the original cell no longer holds a usable charge or fails to power the phone through basic daily tasks.

• G380 and F165 series compatibility: These models share the same battery bay dimensions, contact layout, and BMS handshake protocol — all referencing OEM part Li3713T42P3h614057. The connector pinout and physical clearance match across the G380, J-G380, F165, and F165i without modification.
• Bench tested on actual hardware: We cycled this cell through a full discharge and charge sequence on G380 hardware. The BMS accepted the cell on the first cycle, charge current ramped correctly, and the protection circuit triggered at the expected low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after fitting this cell. The fuel gauge IC on the G380 is calibrated to the old cell's discharge curve — one full cycle at standard current lets it remap against the new cell before any high-current charging session.

Sudden shutdown at 20–30% on the G380 after a cell swap

The G380's fuel gauge IC maps voltage to percentage using a curve stored from the previous cell. A new cell has a slightly different discharge curve, so the voltage drops faster than the IC expects under modem or screen load. The phone reads 25% but the actual cell voltage has already crossed the shutdown threshold. One full discharge-to-empty followed by an uninterrupted charge to 100% forces the coulomb counter to resync with the new cell's real voltage floor.

Phone feels warm near the battery during the first few charging sessions

A new Li-ion cell has higher internal impedance than a cycled one. During the first few charge sessions, the charge IC pushes current into a cell that resists it more than usual, and that resistance converts some energy to heat. This is normal for the first three to five cycles as the cell conditions and impedance drops. If warmth continues past five cycles or the phone becomes hot to the touch, check that the charge voltage isn't exceeding 4.2V — that points to a charge IC fault, not the cell.