What each of the battery icons indicatesUpdated a month ago

Note - if you have a Yoto Mini the icons will be the same as the Yoto Player (below)

The player battery is charging 
(displays for 3 seconds as you charge the player; to check if it's still charging, short-press the power button)

Battery fully charged

Battery level ok 

Battery low

Battery very low

Battery empty 

(the player will automatically turn off and won't turn on until charged)