AudioVox PPC6800 Compatible Battery 3.7V 1250mAh 35H00077-00M

AudioVox PPC6800 / VX6800 — 3.7V Li-Polymer Replacement Battery (35H00077-00M)

This is a 3.7V, 1250mAh lithium-polymer cell that replaces the original battery in the AudioVox PPC6800, PPC-6800, and VX6800 Windows Mobile pocket PC. It matches OEM part numbers 35H00077-00M, 35H00077-02M, and TRIN160. Physical dimensions are 66.50 × 44.00 × 4.50mm — confirm clearance before installing.

• PPC6800 / VX6800 fit: All three model variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the PPC6800 platform. The BMS communicated correctly with the device charge IC, and charge termination triggered at the expected 4.2V cutoff without fault flags.
• Fuel gauge recalibration on first install: After fitting a new cell, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before resuming normal use. The PPC6800's fuel gauge IC is calibrated to the old cell's discharge curve — skipping this step causes the percentage counter to read inaccurately from day one.

Sudden shutdown at 20–30% on the PPC6800

The PPC6800 shuts down hard when cell voltage drops below roughly 3.5V under load — even if the fuel gauge still reads 20–30%. This happens because the fuel gauge IC maps percentage to an old discharge curve, so the displayed percentage no longer reflects actual cell voltage. The screen and modem together draw enough current to cause a rapid voltage drop that the BMS interprets as a fault condition. Fix this by completing one full discharge-to-shutdown and uninterrupted recharge cycle so the coulomb counter resets to the new cell's curve.

PPC6800 not powering on after sitting in storage

Lithium-polymer cells self-discharge in storage, and the PPC6800's BMS locks out the cell if voltage falls below approximately 2.5V per cell — a hard protection threshold that prevents the device from booting. Connecting the charger will appear to do nothing for up to 15–20 minutes while the charge IC applies a low-current pre-charge to bring the cell above the lockout threshold. Leave the charger connected without pressing the power button. Once the cell recovers above 3.0V, the BMS re-engages and the device will power on normally.