Open Windows Device Manager > Ports (COM & LPT). Look for "Silicon Labs CP210x USB to UART Bridge (COMx)". Note the number (e.g., COM5).
: Click Connect . If successful, the battery icon will appear.
If version 3028 is not listed (newer versions may appear), use the on their site for "Battery View 3028."
Right-click BatteryView.exe > Run as Administrator . This is critical; user-mode often cannot access raw COM ports.