You can use Bluetooth Battery Monitor in trial mode (without activation) and use all features of the program with one limitation:

• Trial mode expires after 7 days.

If you find this program useful, please consider purchasing a license to support the development effort.

The regular price of the license is $7.99, but if you purchase the license during the free trial period, you can get it for $4.99. (38% off)

You can start the purchasing process from the program.

Version 2.20.0 is released

New device support

• Logitech Bolt receiver

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Version 2.19.0 is released

More USB dongle based gaming devices are supported.
Newly supported devices include:

• HyperX Cloud II
• Razer Nari Essential
• Steelseries Rival3, Arctis 1, Arctis 7

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Version 2.17.0 is released

New device support

• Razer wireless (USB dongle based) mice and keyboards

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Version 2.15.0 is released

New/improved device support

• Sony WF-1000XM3
• Apple Magic Keyboards (2021 models)
• Samsung Galaxy Buds series

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Version 2.14.1 is released

• Left/Right/Case display and fine-grain battery level support is extended to more devices, including Apple AirPods, Google PixelBuds, Sony WF-1000XM4.

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Version 2.13.0 is released

• Left/Right/Case display for selected Huawei earbuds is added.

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Version 2.11.2 is released

• Logitech gaming devices support is added.

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Version 2.3.1 is released

• German support is added.
• Overlay battery level on top of the tray icon.
• Shortcut to (dis)connect audio devices.
  Comes in handy when you share non-multipoint headphones with other devices.
  

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Version 2.0.1 is released

Chinese (Simplified), Japanese and Russian support is added.

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Now you can choose Dark Mode interface.

To change the user interface, click the gear icon () and select Settings... in the menu.