Hitachi HPW-200EC - Manual (Page 16)

When you try to recharge a fully charged battery immediately, charging stops to
protect the battery.
If you use your handheld PC in high temperature environment, charging LED will
be illuminated RED color and stop charging automatically.
In this case, disconnect AC adapter and after cooling connect AC adapter to
charge.
Notification LED
LED
is blinking while Alarm is running.
Notification LED
Caution
charging check LED
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