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This video explains how to charge the batteries of the JBL TUNE220yws wireless Bluetooth earbuds.
These earbuds come with a total of three batteries. The biggest battery is located inside of the charging cradle. This is the one, which we charge by using the micro-USB cable. The battery is fully charged as soon as the three LEDs inside of the cradle turn off.
The earbuds themselves charge by placing them inside of the cradle. As soon as they are fully charged, their LED is turning off also. It is ok to leave the earbuds inside of the cradle when they are fully charged. This will also help to keep them protected and not to lose them.