ZTE Blade Apex 2 Replacement Battery 3.8V 2000mAh Li-Polymer

Original Blade Apex 2 / Orange HI 4G — 3.8V Li-Polymer Replacement Battery

This 3.8V, 2000mAh Li-Polymer cell replaces the factory battery in the ZTE Blade Apex 2 and Orange HI 4G smartphones. It matches the original's physical dimensions at 88.91 × 34.73 × 4.25mm for a direct fit inside the battery bay. Voltage and capacity align with the stock specification — 7.6Wh total energy.

• Blade Apex 2 and Orange HI 4G compatibility: Both devices run the same battery bay geometry, connector pinout, and charge IC handshake. One cell covers both variants without adapter or modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Blade Apex 2 unit. The BMS accepted the charge controller handshake cleanly, held voltage through screen-on and modem load, and tripped no thermal or overcurrent faults across three full cycles.
• Fuel gauge recalibration on first use: Disable fast charging if your device supports it, then run one complete discharge down to auto-shutdown followed by a full charge. This lets the coulomb counter map the new cell's discharge curve before resuming normal charge rates.

Why the Blade Apex 2 reports wrong battery percentage after a cell swap

The phone's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the IC is still referencing the old curve — so percentage readings can be off by 10–20% in either direction. The fix is one full discharge-to-shutdown cycle followed by an uninterrupted charge to 100%. After that cycle, the coulomb counter resets its baseline against the new cell's actual capacity and the percentage display stabilises.

Sudden shutdown at 20–30% on the replacement cell

This happens when the phone's display or modem draws a brief high-current spike and the cell cannot sustain voltage through it — the battery hits a voltage cliff before the percentage gauge catches up. It is not a faulty cell; it is the fuel gauge IC firing a low-voltage cutoff while still showing 20–30% because calibration is incomplete. Run one full discharge cycle as described above. If shutdowns persist after two full cycles, check that the battery connector is fully seated — an intermittent contact creates the same voltage-sag symptom.