Dopod S900 DIAM100 Replacement Battery 3.7V 2400mAh

Dopod S900 — 3.7V Li-ion Replacement Battery (DIAM100)

This is a 3.7V, 2400mAh Li-ion replacement battery for the Dopod S900 smartphone. It cross-references OEM part numbers DIAM100, DIAM160, 35H00113-003, and 35H00113-03M. If your S900 drops charge fast, shuts down unexpectedly, or no longer holds a useful charge, this cell restores normal operation.

• S900 compatibility: The S900 uses a shared HTC Diamond-platform battery bay. The DIAM100 and DIAM160 part numbers both map to this same physical form factor and connector pinout — the BMS handshake is consistent across the platform, so this cell initialises correctly on first boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Diamond platform. The BMS accepted the cell without a protection trip, and the charge IC completed a full constant-current to constant-voltage transition without cutoff errors.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge to low battery warning, then charge uninterrupted to 100% before heavy use. Windows Mobile's fuel gauge IC is calibrated to the old cell's discharge curve — one complete cycle resets it to the new cell and stops erratic percentage readings.

Why the S900 reports wrong battery percentage after a cell swap

Windows Mobile uses a coulomb counter paired with a learned discharge curve from the previous cell. When you install a fresh cell, that stored curve no longer matches actual cell behaviour. The OS will show percentages that lag, jump, or freeze at values like 60% before suddenly dropping. One full discharge-charge cycle forces the fuel gauge IC to relearn the new cell's voltage-to-capacity relationship and corrects the readout.

Sudden shutdown at 20–30% on the S900 after replacement

This happens when the fuel gauge IC hasn't recalibrated yet and the cell voltage drops below the load-sustain threshold faster than the OS expects. The S900's display, modem, and GPS together draw enough current to cause a rapid voltage sag on an uncalibrated cell. The phone interprets this sag as a dead battery and cuts power. Complete one full uninterrupted charge cycle and let the phone reach the low-battery warning naturally — after that cycle, the cutoff should shift back to below 10%.