There is a battery icon next to the Bluetooth icon on my G4's status bar. What is it?
What is the battery icon?
An icon that shows Bluetooth and battery together appears when a battery-equipped Bluetooth
device is connected.
How to use
Remaining battery will be displayed when a Bluetooth device with a battery is paired.
By grouping icons together, you can see more detailed information at a glance and have
a wider notification bar.