A very lightweight Windows system tray application that monitors the battery levels of connected Bluetooth devices.

I was frustrated with bloated bluetooth vendor software when all I wanted was a simple low battery warning notification so I built Battify.

Download from the releases page:

• Battify-Setup-x.x.x.exe - Installer (recommended) - Includes Start Menu shortcut and optional Windows startup
• Battify-Portable-x.x.x.zip - Portable version (no installation required)

• System Tray Integration: Runs quietly in the system tray
• Battery Monitoring: Monitors battery levels of connected Bluetooth devices at your specified interval
• Low Battery Notifications: Shows balloon notifications when device battery drops below the specified threshold
• Visual Battery Indicator: Tray icon changes color based on the lowest battery level among all devices
• Quick Access Menu: Right-click tray icon for options to view battery levels, refresh, or exit
• Device Information: View all connected Bluetooth devices and their battery status

• Windows 10/11 (version 1903 or later recommended)
• Bluetooth-enabled computer
• Bluetooth devices that support battery level reporting (GATT Battery Service)

1. Launch: The application starts minimized to the system tray
2. Tray Icon: Shows a battery indicator reflecting the lowest battery level among connected devices
3. Right-click Menu:
   • Show Battery Levels: View battery percentages with status indicators
   • Show Connected Devices: List all connected Bluetooth devices
   • Refresh: Manually refresh device list and battery levels
   • Exit: Close the application
4. Double-click: Quick access to battery levels
5. Notifications: Automatic low battery alerts at specified threshold

• ✅ Good (60%+): Green battery icon
• ⚡ Medium (30-59%): Orange battery icon
• ⚠️ Low (0-29%): Red battery icon

The application uses Windows Runtime APIs to:

• Enumerate connected Bluetooth devices via BluetoothDevice.GetDeviceSelector()
• Monitor connection status changes
• Access GATT Battery Service (UUID: 0x180F) when available
• Read Battery Level Characteristic (UUID: 0x2A19)

Supported Devices:

• Modern Bluetooth headphones and earbuds (AirPods, Sony, Bose, etc.)
• Wireless gaming controllers (Xbox, PlayStation)
• Bluetooth mice and keyboards
• Fitness trackers and smartwatches
• Any Bluetooth LE device implementing GATT Battery Service

Note: Older Bluetooth devices may not support battery level reporting.

Requirements:

• .NET 8.0 SDK (https://dotnet.microsoft.com/en-us/download/dotnet/8.0)
• Windows 10/11 development environment

git clone https://github.com/sendmebits/battify.git
cd battify
build-standalone.bat
Battify-Standalone\Battify.exe

No devices showing:

• Ensure Bluetooth is enabled
• Check that devices are paired and connected
• Some devices may not support battery reporting
• Try refreshing manually from the context menu

Permission errors:

• Run as administrator if needed
• Check Windows privacy settings for Bluetooth access

Battery levels not updating:

• Device may not support GATT Battery Service
• Try refreshing manually from the context menu