Verizon XV6800 Replacement Battery 3.7V 1250mAh

Verizon XV6800 — 3.7V Li-Polymer Replacement Battery (35H00077-00M)

This 3.7V, 1250mAh Li-Polymer battery replaces the original cell in the Verizon XV6800 (XV-6800) Windows Mobile smartphone. It matches the OEM part numbers 35H00077-00M, 35H00077-02M, and TRIN160. If your XV6800 no longer holds a charge or shuts down unexpectedly, this is the correct replacement cell.

• XV6800 fitment: The XV6800 uses a single-cell Li-Polymer pack at 3.7V nominal with a proprietary connector and BMS handshake tied to HTC's hardware platform. Both OEM part numbers (35H00077-00M and 35H00077-02M) share the same cell footprint and connector pinout, so this replacement covers both revisions.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on the XV6800 platform. The BMS accepted the new cell without fault flags, and the charge IC transitioned through CC and CV phases cleanly at the expected 4.2V cutoff.
• Fuel gauge recalibration on first use: After installation, run one complete discharge to auto-shutoff followed by a full charge before relying on the battery percentage indicator. The XV6800's fuel gauge IC holds calibration data from the old cell — one full cycle rewrites it against the new discharge curve.

Sudden shutdown at 20–30% on the XV6800 after a cell swap

The XV6800 uses a coulomb-counter fuel gauge that was calibrated to the original cell's internal resistance and discharge curve. A new cell has different impedance characteristics, so the gauge's voltage-to-percentage mapping is wrong until a full cycle runs. Under modem or screen load, the new cell's terminal voltage drops faster than the gauge expects, crossing the low-voltage cutoff threshold while the display still reads 20–30%. Run one full discharge to auto-shutoff and charge back to 100% — this resets the gauge's empty-point register to match the new cell.

XV6800 not powering on after sitting in storage

Li-Polymer cells self-discharge in storage, and if the XV6800 sat unused for several months, the cell voltage may have dropped below 2.5V — the BMS lockout threshold. Below that point, the BMS opens the protection circuit to prevent cell damage and the phone will not respond to a normal charge attempt. Connect the device to a wall charger rather than a PC USB port, which delivers a controlled trickle current. Leave it connected for 30–60 minutes before pressing the power button — wall chargers provide enough current to push the cell above 2.9V and allow the BMS to re-engage the circuit.