The battery icon turns RED to indicate that the battery is low, and it gives a beep every 16 seconds.

The battery pack takes about 12 hours to charge fully. 

1. During power OFF, when adapter is plugged in, an adapter logo will display on screen and a flashing battery logo will display for 15 sec. The Blue LED at the top left corner will light up that indicates that the adapter is plugged in.

2. During power ON, when adapter is plugged in, the battery icon on the screen's top right corner will show that the battery is charging. The Blue LED at the top left corner will light up to indicate that the adapter is plugged in.