Bluetooth Battery Monitor

A .NET 8 Windows system tray application that monitors battery levels for Bluetooth devices.

Features

• Per-device system tray icons with battery level indicators (full, good, medium, low, empty)
• Supports Bluetooth LE (GATT Battery Service), Bluetooth Classic (HFP via CfgMgr32), and Windows device property fallback
• WebView2 configuration dialog for selecting which paired devices to monitor
• Device configuration persisted in Windows Registry (HKCU\SOFTWARE\JPIT\BluetoothBatteryMonitor)
• Automatic device connect/disconnect detection via DeviceWatcher with periodic state verification
• DPI-aware with icon refresh on display/session changes (including RDP reconnect)
• Single-instance enforcement

Getting Started

On first launch, a sentinel battery icon appears in the tray. Right-click it and select Configuration to choose which paired Bluetooth devices to monitor. Selected devices will each get their own tray icon showing battery status.

Usage

• Right-click any tray icon for status info, configuration, or to exit
• Double-click any device icon to open Windows Bluetooth settings
• --listdevices flag: shows all paired Bluetooth devices in a dialog and exits

Prerequisites

Building (Debian/Linux):

• .NET 8 SDK
• Node.js
• GNU Make

Running (Windows 10/11):

• .NET 8 Desktop Runtime — download
• WebView2 Runtime — included with Windows 11; download for Windows 10
• Windows 10 build 19041 or later

Building

make          # full build: frontend + .NET publish
make clean    # remove all build artifacts

Output: release/BluetoothBatteryMonitor.exe

License

MIT