This normal behavior of your number pad.
The green battery light on your N305 will come on for a few seconds to indicate the battery condition and then will go out. This happens when you power on your N305 and when you replace the batteries. The battery light goes out after a few seconds to conserve battery power.

Additional Information:
If the above solutions do not resolve your problem, consult Knowledge Base article 14151 for instructions on contacting Logitech Technical Support.
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