O2 XDA Atoms Replacement Battery LIBR160 3.7V 2250mAh

O2 XDA Atoms — 3.7V Li-ion Replacement Battery (LIBR160)

This is a 3.7V, 2250mAh Li-ion cell built to fit the O2 XDA Atoms PDA phone. It replaces part numbers LIBR160 and 35H00082-00M directly. If your XDA Atoms no longer holds a charge or powers off unexpectedly, this cell is the correct swap.

• XDA Atoms fit: The XDA Atoms uses a dedicated battery bay with a fixed connector pitch and BMS communication line. This cell matches that footprint at 54.03 × 39.60 × 11.37mm and communicates correctly with the device's charge controller — no hardware modification required.
• Bench tested on actual hardware: We ran the cell through a full charge cycle and monitored BMS handshake and cutoff thresholds. The protection circuit triggered correctly at the low-voltage floor and the charge IC accepted the cell without error flags.
• Fuel gauge recalibration after install: On first use, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. The XDA Atoms fuel gauge IC is calibrated to the old cell's discharge curve — skipping this step causes the percentage display to read inaccurately from the first charge.

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

The XDA Atoms uses a coulomb-counter fuel gauge IC that builds its capacity model from accumulated charge and discharge data on the original cell. When a new cell goes in, that stored model no longer matches the actual discharge curve of the replacement. The gauge will read confidently but incorrectly — typically showing full charge when the cell is at 80%, or jumping several percentage points without load change. One full uninterrupted discharge-to-shutdown followed by a complete charge cycle forces the IC to rewrite its reference curve against the new cell.

Sudden shutdown at 20–30% on the XDA Atoms after replacement

This happens when the cell voltage drops sharply under the load of the radio modem or backlight — a voltage cliff the fuel gauge didn't anticipate. The BMS reads a voltage collapse below its cutoff floor and disconnects the cell to protect it, even though the reported percentage looks safe. It is not a faulty battery — it is an uncalibrated gauge misjudging remaining capacity. After one full recalibration cycle, the gauge learns where the actual voltage cliff sits and begins shutting down at 5–8% instead. If the problem persists after calibration, measure resting cell voltage with a multimeter — it should read above 3.6V at what the device reports as 30%.