Verizon XV-6800 Replacement Battery 3.7V 2600mAh Li-ion

Verizon XV-6800 — 3.7V Li-ion Replacement Battery (35H00077-00M)

This is a 3.7V, 2600mAh Li-ion battery for the Verizon XV-6800 smartphone. It replaces OEM part numbers 35H00077-00M, 35H00077-02M, and TRIN160. The XV-6800 is a Windows Mobile PDA phone — this battery powers the processor, display, cellular radio, and Wi-Fi simultaneously.

• XV-6800 platform fit: Both the XV-6800 and XV6800 designations refer to the same HTC-manufactured device sold on Verizon. The connector pinout and BMS communication protocol are identical across the run — this cell seats and handshakes on all units.
• Bench tested on actual hardware: We cycled this battery through full discharge and recharge on the XV-6800. The BMS accepted the charge current without fault flags, and the fuel gauge IC began tracking the new cell curve after one complete cycle.
• Fuel gauge recalibration on first use: After installation, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before enabling any sync or push services. This gives the Windows Mobile fuel gauge IC a clean discharge curve to reference — skipping this step causes erratic percentage readings in the first week.

Why the XV-6800 reports wrong battery percentage after a cell swap

The XV-6800 uses a coulomb-counter-based fuel gauge IC that stores a discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts from reality. You may see the phone report 40% and drop to shutdown within minutes, or hold at 20% far longer than expected. One full uninterrupted discharge-to-shutdown followed by a full charge resets the reference curve. After that cycle, percentage accuracy stabilises.

Sudden shutdown at 20–30% remaining on the XV-6800

This is a voltage cliff issue, not a capacity problem. The XV-6800 draws a combined load from the CDMA radio, display backlight, and processor — under that combined pull, a cell with any internal resistance variation drops voltage faster than the fuel gauge predicts. The BMS trips a low-voltage cutoff before the reported percentage reaches zero. If this happens, charge the battery to 100%, then perform the single full-discharge recalibration cycle. If shutdowns continue past that, check that the battery contacts on the phone chassis are clean and making full contact — even slight resistance at the connector accelerates the voltage drop under load.