ZTE Z768G Li-ion Replacement Battery 3.7V 1500mAh

ZTE Z768G / Z992 / Z993 Series — 3.7V Li-ion Replacement Battery (Li3715T42P3h504857)

This is a 3.7V, 1500mAh Li-ion cell for the ZTE Z768G, Z992, Z993, Prelude, and 16 additional ZTE models sharing the same OEM part number Li3715T42P3h504857. It replaces an original cell that has degraded, lost hold time, or failed to charge. Voltage and form factor match the OEM spec at 49.00 × 47.80 × 5.50mm.

• Z768G / Z992 / Z993 platform compatibility: These models share the same battery bay dimensions, connector pinout, and BMS handshake requirements — all drawing from the same OEM cell pool. Swapping between them uses the same physical and electrical interface.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Z768G platform. The BMS accepted the cell without lockout, charge termination triggered correctly at full voltage, and the protection circuit responded normally to load spikes from the modem and display.
• Fuel gauge recalibration on first use: On first install, disable fast charging and run one full discharge-to-charge cycle before enabling it again. The fuel gauge IC in these ZTE models calibrates its coulomb counter against the cell's discharge curve — skipping this step on a new cell can cause erratic percentage readings for the first several cycles.

Sudden shutdown at 20–30% on the Z768G after a cell swap

This happens because the fuel gauge IC still holds the discharge curve map from the old, degraded cell. When voltage drops under modem or screen load, the phone hits the hardware cutoff voltage before the gauge catches up. The gauge reads 20–30% but the cell is already at or below 3.4V under load. One full discharge-to-charge cycle forces the coulomb counter to remap against the new cell's actual voltage curve. After that cycle, the percentage readings align with real remaining capacity.

Phone feels warm near the battery during the first few charges

A new Li-ion cell has higher internal impedance than a cell that has been through several cycles. The charge IC has to work harder to push current through that higher resistance, and that effort shows up as heat at the battery. This is normal for the first two to three charge cycles as impedance drops toward its operating baseline. If warmth continues past three full cycles or the phone becomes hot to the touch, check that the charge port and cable are delivering correct voltage — charging via a degraded cable on a 3.7V cell can cause the charge IC to compensate incorrectly.