Epson ActionNote 650 User Manual page 54

If you are using only battery power to run your computer, you
do not see the AC Power or Battery Charging icons. The
Battery Status icon changes as follows as you use up battery
power:
Note
Times and percentages are approximates only, and may
differ depending on how you are using your computer.
When the Battery Status icon blinks, you have about
10 minutes of power left; insert a spare battery (as described in
the next section) or connect the AC adapter (as described in
Chapter 1).
3-6
Powering the Computer
Your battery is charged at approximately 76% to
100% of capacity
Your battery is charged at approximately 51% to
75% of capacity
Your battery is charged at approximately 26% to
50%of capacity
Your battery is charged between low battery
status and 25% of capacity
Your battery power is low; you have
approximately 20 minutes of power left.