Bluetooth accessories and headsets offer the possibility of listening to music or making calls without having to constantly untangle wires. Problem, when the battery is depleted, the music suddenly stops thus depriving you of your dose of music. Very annoying, right? To finish with this, here is how to display the percentage of remaining battery of your speaker or your Bluetooth headset directly on the screen of your Android smartphone..
Battery status of your Bluetooth accessory
The wireless headphones , headsets and Bluetooth speakers have done in recent years enormous progress. They now offer quality sound, in particular thanks to the efforts made by the manufacturers. Today we find very good models at less than 150 euros with price reduction system.
Performance that does not leave consumers insensitive. Sales of Bluetooth accessories have surged in recent years. Only downside, the still a little low autonomy of these devices requires users to recharge them several times a week. Unlike wired headphones, both Bluetooth transmission and noise reduction devices require power..
Checking the battery charge level
If you are used to listening to music for long hours, you should remember to check the rechargeable battery level of your earphones or wireless headphones regularly . And this is where the problems start.
To check the charge level, you generally have to keep the On / Off button pressed and monitor the color of the battery indicator or count the number of flashes (three flickers high battery level, two flickers medium level and only one low level , charge required). It is very nice these small LEDs but level precision we have known better..
View the remaining battery percentage of your Bluetooth device
In the 21st century, we have the right to hope for a system that is far more efficient than these little Christmas tree lights. Fortunately we find on the Play Store free applications capable of filling this gap such as for example: BatOn
Once it is installed and configured on your phone, you will be able to know precisely how long you can use any Bluetooth device. 
This very simple to use application is compatible with most Bluetooth headsets, earphones, ears or speakers available on the market.
How BatOn works
BatOn displays an estimate of the remaining battery time of your Bluetooth device once it is connected to your Android smartphone. It does not require any special knowledge and works on all phones with at least Android 4.3 (and higher).
- Open the application drawer of your smartphone and launch the Play Store app
- In the search field at the top of the screen type BatOn or click on this link
- Then start the installation procedure by clicking on the Install button
- Open the app
- During the first launch, BatOn may ask you to validate an authorization to use and in particular a location permission. This is necessary to allow the app to be able to access the Bluetooth devices connected to your smartphone. Note that this choice is not final. These permissions can be changed after the fact.
- Then open the BatOn settings
- Uncheck the boxes next to the devices that you do not want to be notified of with their battery life.
- Still in the settings, click Measure Frequency in the Auto Measure section and set the frequency at which BatOn will check the battery level of your Bluetooth equipment.
Obviously, the shorter the time between each update, the more precise the information given. Please note, however, too high a frequency may drain the battery of your smartphone and that of your Bluetooth accessory.
This is the BatOn application is now configured on your smartphone. Now each time a Bluetooth headset is connected to your smartphone, you just need to launch the BatOn application to know its charge level precisely. 
The percentage of remaining battery is also accessible from the notifications panel of Android.