There are two status LEDs on your tablet keyboard:
While powering on:
Glows solid green when the keyboard turns on and then goes off to save energy. The keyboard has enough charge to use.
Flashes red when the battery is low. You should charge your tablet keyboard when you can.
Flashes green while actively charging.
Glows solid green when fully charged.
After powering on:
Quickly blinking blue — the keyboard is in discovery mode.
Slowly blinking blue — the keyboard is trying to reconnect to your Apple device.
Glows solid blue — the keyboard is paired or connected. The light then turns off to save energy.