Dopod D810 Replacement Battery 3.7V 1250mAh

Dopod D810 / CHT9100 — 3.7V Li-Polymer Replacement Battery (35H00077-00M)

This 3.7V 1250mAh lithium-polymer cell replaces the original battery in the Dopod D810, CHT9100, 9100, and E616 smartphones. It fits the same physical bay and connector as the factory cell and restores power to the processor, display, and radio stack. Capacity is rated at 1250mAh (4.63Wh) — identical to the original specification.

• D810 / CHT9100 platform fit: These models share the same 3.7V single-cell Li-Po architecture, battery bay dimensions (66.50 × 44.00 × 4.50mm), and connector pinout — so one cell covers the full variant range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the D810 platform and confirmed the BMS handshake completes correctly — the charge IC accepted the cell and ran a full charge cycle without tripping a fault flag.
• Fuel gauge recalibration on first use: On first installation, run one complete discharge down to auto-shutdown and then charge fully without interruption. The D810's fuel gauge IC maps its state-of-charge curve against that first cycle — skipping it leaves the coulomb counter calibrated to the old cell's degraded curve.

Why the D810 reports wrong battery percentage after a cell swap

The D810 uses a fuel gauge IC that builds its state-of-charge model from accumulated charge and discharge data. When you install a new cell, that model still reflects the degraded capacity curve of the old battery. The IC will report percentages that don't match the new cell's actual voltage curve — often reading high then dropping sharply. One full discharge-to-shutdown followed by an uninterrupted charge cycle forces the IC to rebuild its reference curve against the new cell.

Sudden shutdown at 20–30% on the D810 after replacement

This happens when the fuel gauge IC hasn't completed recalibration and the phone hits a voltage cliff under load — typically when the modem transmits or the display backlight peaks. The cell voltage drops faster than the uncalibrated counter expects, and the protection circuit cuts output before the reported percentage reaches zero. Run the recalibration cycle first: discharge fully until the device powers off on its own, then charge to 100% in one continuous session. After that cycle, the IC tracks the actual cell voltage curve and shutdown at 20–30% stops.