Orange Miami 3.7V Replacement Battery Li3708T42P3h463657 800mAh

Orange Miami / ZTE-G N281 — 3.7V Li-ion Replacement Battery (Li3708T42P3h463657)

This is a 3.7V, 800mAh Li-ion cell for the Orange Miami and ZTE-G N281 smartphones. It replaces part numbers Li3708T42P3h463657 and Li3708T42P3h463657-NTC. Fit this battery when the original cell no longer holds a charge or the phone shuts down unexpectedly.

• Orange Miami and ZTE-G N281 compatibility: Both devices share the same battery bay dimensions, connector pinout, and BMS handshake protocol — a single 46.26 × 35.60 × 5.68mm cell covers either unit without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on both supported models. The BMS accepted the cell without triggering thermal cutoff or overvoltage protection, and charge current tapered correctly in the constant-voltage phase.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before the OS starts reporting percentage — skipping this step causes erratic readings for the first several cycles.

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

The Orange Miami's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell with a slightly different internal resistance hits a voltage cliff at a different state of charge than the IC expects. When the modem fires or the screen peaks in brightness, load current spikes and cell voltage drops below the shutdown threshold — even though the reported percentage looks safe. The fix is one full discharge to auto-off followed by a full charge with the screen on during discharge to stress the cell under realistic load. After that cycle the IC re-anchors its curve to the new cell and premature shutdowns stop.

Phone shows 100% immediately after charging but drops to 60% within minutes

This is a coulomb counter drift issue, not a faulty cell. The fuel gauge IC accumulated counting errors over time with the old cell and those errors carry over after the swap. The IC thinks the battery is full because it tracked charge-in, but it has no accurate reference for the new cell's actual capacity. Run two full discharge-charge cycles with the screen active during discharge — do not interrupt them. After the second cycle the counter resets its baseline and the percentage reading stabilises.