Epson ActionNote 650 User Manual page 53

If you have the AC adapter connected, you see the AC Power
icon in the System Window. If the battery is currently charging,
you see the Battery Charging icon and the Battery Status icon
changes as follows to inform you of the charging status:
When the battery is fully charged, the Battery Charging icon
disappears and the AC Power and Battery Status icons appear
as follows:
Powering the Computer 3-5