Why does the light blink green?

See the user manual. It gives all details.
BQ-CC75 - Panasonic

Depending on the color the lights blinking. Red light blinking usually means charging. Green light on or blinking usually means charged. If its blinking red and green, usually means bad, or defective battery.

Here's a guide;
What do the battery lights mean on my mouse? Some keyboard and mouse models feature a battery light that shows the current status of the batteries. The following table describes the different lights and states.
Light
Device Model Status Single long green blink Rechargeable Batteries are good. This occurs when batteries are first installed or every time that the device is turned on. Slow green blink Rechargeable Device is docked in the charging station and is charging properly. Steady green Rechargeable Device is docked in the charging station and does not need additional charging. Steady green Presenter Mouse (Japanese version) Laser pointer is on. Red/green blink Wireless Device is discoverable (trying to connect to the transceiver). Slow red blink Non-rechargeable Batteries are low and need to be replaced. Slow red blink Rechargeable Batteries are low and need recharging. Fast red blink Rechargeable Device is docked in the charging station, but there is a charging error.
Reasons for errors: The wrong type of battery is installed; the battery or batteries are missing; or the battery connection is bad.
Solutions: Make sure that the correct battery or batteries are installed, and are installed correctly. If necessary, remove the batteries, wipe them with a clean cloth, and reinsert them. Steady red Presenter Mouse (Standard version) Laser pointer is on.

Yes, the was bothering me for some time. I think the indicator is a little green light that blinks in the extreme upper left hand portion of the phone...not on screen, above it....but the blinking light may indicate a missed call or a voice mail is present.

Try this. Go into your phone icon, press and hold '1' and listen to any open messages. Delete each. Next go into your Call Log and delete all call history. Now exit.There should be no green light flashing in the upper left hand corner of phone. You have just cleared everything.

Next call your phone but hang up before leaving a message. Note the blinking green light in the upper left hand corner apparently indicating you missed a call. Go into your Call Log. It will say one missed call. Exit the call log and note that the blinking light is now off. You have acknowleged the call in the call log so the light goes off when you exit.

Call the phone again. This time leave a message. Note the blinking light again. Go into your call log again. Note the missed call. It would be nice if there was an icon or something HERE that indicates if this call left a voice message....but there does not appear to be. Exit again. This time note that the light continues to blink even though you entered the call log and acknowleged the call. I believe it continues to blink because you have a voice message. Exit.

Go into the call log again. Delete the missed call from the call hsitory. Exit. The light still blinks, I believe still indicating a voice message.

Go to your phone icone. Press '1' to check messages, delete the message and exit. The blinking is now gone.

So it appears a blinking green light indicates a missed call. If it still blinks after exiting the call log, you have a voice message.

If someone figures something else out let me know because this stinks!

the green light are usually a notification of new emails, miss calls things you missed

In this case when you get the light blinking have your charging system look at,

Hello abevagota25,

A flashing red indicator light (upper left-hand corner) occurs when the Centro is connecting to the the cell phone network. The light will continue to blink until it gets a strong enough signal to make a good connection. Try turning the phone on from different locations to see which one makes a good connection

If this solution is helpful please click a thumbs-up rating below.

Have a great day,
martyshaw152

Hello,
Usually when you listen to all your messages (no new ones) the blinking stops automatically.
Hope it helps.

Remove the battery to reset it and then try turning it on again. This should reset the system and fix your problem

You may have the battery light reminder on...so you will need to take it off