ZTE Grand X Li3716T42P3h594650 Replacement Battery 3.7V 1600mAh

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

This 3.7V, 1600mAh Li-ion cell replaces the factory battery in the ZTE Grand X, Grand X 3G, Grand X LTE, Mimosa X, and compatible variants. It matches the OEM dimensions at 59.40 × 46.00 × 5.10mm, so it seats correctly without case modification. Voltage and capacity align to the original ZTE specification — Li3716T42P3h594650 is the primary OEM reference.

• Grand X platform compatibility: The Grand X, Grand X 3G, and Grand X LTE share the same battery bay dimensions and connector pinout, which is why a single cell covers all three. The BMS communication protocol is consistent across the platform, so the fuel gauge IC on each handset reads the replacement cell without a firmware conflict.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Grand X platform. The BMS accepted the cell on first connection, charge current stepped correctly through CC/CV phases, and the protection circuit triggered at expected low-voltage cutoff — no false trips under screen or modem load.
• Fuel gauge recalibration on first use: On first installation, disable fast charging and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC build an accurate discharge curve against the new cell before the charge IC pushes higher current into an uncalibrated coulomb counter.

Why the Grand X reports wrong battery percentage after a cell swap

The ZTE Grand X uses a fuel gauge IC that stores a learned discharge curve from the previous cell. When you install a fresh 1600mAh cell, that stored curve no longer matches the new cell's actual voltage-to-capacity relationship. The result is a percentage reading that jumps, stalls, or drops faster than expected during the first few cycles. One full slow-charge cycle — charge to 100%, drain to automatic shutdown, recharge fully — lets the IC recalibrate its coulomb counter to the replacement cell and restores accurate reporting.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem or display load threshold before the fuel gauge reaches 0%. The Grand X's modem radio draws sharp current spikes during data transmission, and a cell that hasn't completed a calibration cycle can hit the BMS low-voltage cutoff — around 3.0V — while the OS still shows charge remaining. The fix is the same recalibration cycle: one full discharge to automatic shutdown, then a full charge. After that cycle, the fuel gauge IC maps the voltage cliff correctly and stops triggering early shutdown.