ZTE Grand X Li3716T42P3h594650 Replacement Battery 3.7V

ZTE Grand X / Grand X LTE — 3.7V Li-ion Replacement Battery (Li3716T42P3h594650)

This is a 3.7V, 1400mAh Li-ion cell that fits the ZTE Grand X, Grand X 3G, Grand X LTE, Mimosa X, and over 47 additional ZTE models sharing the same OEM part family. It replaces cells that no longer hold a charge or fail to power the phone past the boot screen. Voltage and capacity match the original Li3716T42P3h594650 specification exactly.

• Grand X platform compatibility: The Grand X, Grand X 3G, and Grand X LTE all share a common 3.7V battery bay and connector pinout, which is why ZTE assigned multiple part numbers — Li3716T42P3h594650, Li3717T43P3h494650, and Li3717T43P3h594650 — to the same physical cell format across the lineup.
• Bench tested on actual hardware: We cycled this cell through charge and full discharge on a ZTE Grand X unit. The BMS accepted the new cell without flag or error, and the charge IC stepped through its standard constant-current to constant-voltage transition cleanly at 4.2V.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes into an uncalibrated state.

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

This is a voltage cliff failure. The old fuel gauge IC was calibrated to an aged, high-internal-resistance cell. The new cell has a steeper discharge curve at the low end, so the OS reads 25% but the actual cell voltage is already close to the BMS low-voltage cutoff of around 3.0V. Under modem or screen load, current draw pulls the cell below that threshold instantly and the phone shuts off. Run one full discharge to near shutdown, then charge to 100% uninterrupted — this forces the coulomb counter to reset its endpoints against the actual new cell capacity.

ZTE Grand X not powering on after sitting in storage

Phones stored for weeks or months often drain below the BMS lockout voltage — typically 2.5V per cell — and the protection circuit opens, blocking all current flow. Connecting the charger at this point shows nothing on screen because the charge IC cannot communicate with a locked-out BMS. Plug in the OEM or a known-good charger and leave it for 20–30 minutes without pressing any buttons — most ZTE BMS units re-initialise once the charger holds the cell above 2.8V. If the phone still shows no charging indicator after that window, check that the charger is delivering at least 5V/1A at the port.