Battery level indication
The battery indicator shows how much charge is left in the pen battery.
When the battery indicator is green, the pen is sufficiently charged.
When the battery indicator is yellow, the battery is less than 50%
charged.
When the battery indicator is red, battery power is low; when the
indicator flashes red, battery power is too low for operation. Recharge
the battery.
You can also check the battery level using the charge meter in the
Battery level indication section at the back of a supplied notepad. Move
the pen tip from left to right. The pen indicates the current charge level
by vibrating.