O2 XDA Star NIKI160 Replacement Battery 3.7V 2200mAh

O2 XDA Star — 3.7V Li-ion Replacement Battery (NIKI160)

This is a 3.7V, 2200mAh Li-ion cell for the O2 XDA Star Windows Mobile smartphone. It replaces OEM part numbers NIKI160, 35H00103-00M, and 35H00103-01M. If the original cell is swelling, dropping charge quickly, or failing to hold a voltage above 3.5V under load, this is the direct swap.

• XDA Star platform fit: The XDA Star uses a single-cell 3.7V Li-ion pack with a three-pin connector that carries both charge and BMS communication. All three OEM part numbers above use the same connector, pin-out, and cell footprint — 46.71 x 44.08 x 11.28mm — so this unit seats and locks without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the XDA Star platform, confirming the BMS handshake completes correctly and the device exits charge mode at the expected 4.2V cutoff. No thermal event occurred during the first three cycles.
• Fuel gauge recalibration on first cycle: After fitting this cell, run one full uninterrupted discharge to the device's auto-shutoff point, then charge to 100% without interruption. The XDA Star's fuel gauge IC needs one complete cycle against the new cell's discharge curve to report accurate percentages.

Why the XDA Star reports wrong battery percentage after a cell swap

The XDA Star uses a fuel gauge IC that builds its capacity model from learned discharge curves stored against the original cell. When you fit a new cell, that stored model no longer matches the actual cell chemistry. The IC keeps applying the old curve, so it reports percentages that drift — often reading 80% and dropping to shutdown with no warning. One full discharge-charge cycle forces the IC to rewrite its reference curve against the new cell and restores accurate reporting.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the BMS cutoff threshold under a combined screen and radio load, even though the fuel gauge still shows charge remaining. On the XDA Star, the modem and display pulling current simultaneously can cause a voltage sag that triggers a hard BMS cutoff before the gauge catches up. It is most common in the first few cycles on a new cell before the fuel gauge IC has recalibrated. After one complete discharge-charge cycle, check that resting voltage sits above 3.7V — if it does not, the cell may have been shipped in a deep-discharge state and needs a slow pre-charge at 100mA before a normal cycle.