Dopod U1000 ATHE160 Replacement Battery 3.7V 2000mAh

Dopod U1000 — 3.7V Li-ion Replacement Battery (ATHE160)

This is a 3.7V, 2000mAh Li-ion battery for the Dopod U1000 Windows Mobile smartphone. It replaces OEM part numbers ATHE160 and 35H00081-00M. If your U1000 no longer holds a charge or shuts down unexpectedly, this is the direct cell replacement.

• U1000 platform fit: The U1000 uses a fixed form factor battery with a specific connector pinout tied to the device's charge IC. This cell matches the 73.39 × 54.60 × 5.50mm physical envelope and the 3.7V nominal voltage rail the board expects — no modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a U1000 unit. The BMS handshake completed correctly, the charge IC accepted the cell without fault codes, and voltage held steady under combined screen and radio load.
• Fuel gauge recalibration on first use: On first installation, run one full discharge to low battery warning, then charge uninterrupted to 100%. This gives the U1000's fuel gauge IC one complete reference cycle against the new cell's discharge curve before it starts reporting accurate percentages.

Why the U1000 reports wrong battery percentage after a cell swap

The U1000 uses a fuel gauge IC that builds a discharge model over time based on the old cell's internal resistance and capacity curve. When you install a new cell, that stored model no longer matches reality. The IC reads voltage and applies the old curve, so the percentage shown can be 20–30% off in either direction. One full discharge-charge cycle forces the IC to reset its reference points against the new cell. After that cycle, percentage accuracy returns to normal.

Sudden shutdown at 20–30% remaining on the U1000

This happens when the cell cannot sustain voltage under peak load — typically when the modem, display, and processor pull current simultaneously. The cell voltage drops below the BMS cutoff threshold even though the fuel gauge still shows charge remaining. It is a voltage sag issue, not a capacity issue. If this occurs on a new cell, complete two full discharge-charge cycles to allow the fuel gauge IC to recalibrate; the shutdowns typically stop once the IC's model aligns with the new cell's actual low-voltage curve, around 3.4–3.5V under load.