Dopod S700 JADE160 Replacement Battery 3.7V 2200mAh

Dopod S700 — 3.7V Li-ion Replacement Battery (JADE160)

This is a 3.7V, 2200mAh Li-ion cell that replaces the original JADE160 battery in the Dopod S700 Windows Mobile smartphone. It also cross-references as 35H00118-00M and BA S330. If your S700 won't hold a charge, shuts down unexpectedly, or won't power on after sitting in storage, this cell addresses each of those failure points.

• S700 fit confirmation: The S700 uses a dedicated battery bay sized for the JADE160 footprint — 51.76 × 37.14 × 10.83mm. The connector and contact rail match the original layout, so the phone's charge IC communicates with the cell without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the S700 platform. The BMS held cutoff at the correct low-voltage threshold and accepted charge from the S700's onboard charge controller without triggering protection lockout.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge down to auto-shutdown, then charge uninterrupted to 100% before heavy use. The S700's fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle resets it against the new cell's actual capacity.

Why the S700 reports wrong battery percentage after a cell swap

The S700 uses a fuel gauge IC that tracks charge by measuring voltage and current against a stored discharge curve from the original cell. A new cell has a different internal impedance profile, so the gauge reads against the wrong curve and reports inaccurate percentages. This shows up as the indicator jumping several percent in either direction or stalling at a fixed value. One complete discharge-to-shutdown followed by an uninterrupted full charge resets the coulomb counter and aligns the gauge to the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — the screen backlight, radio, and processor all draw simultaneously, pulling the cell below the BMS cutoff threshold even though the gauge still shows charge remaining. On mid-2000s Windows Mobile devices, the modem radio is a particular spike load during calls or data sync. The phone interprets this voltage cliff as a fault and cuts power instantly. Charge the battery fully, then check that the shutdown threshold matches — if it recurs consistently at the same percentage, run another full calibration cycle to 3.7V nominal.