Does a flashing yellow light on a wireless mouse mean that the battery is dying?

Question edited for clarity.

It needs charging!

Why is the yellow light flashing on my rii keyboard?
A: the yellow light flashes when it needs to be charged or when the receiver is not plugged in to the usb on computer. Try charging it and fully plugging in the little receiver.

the yellow light is blinking and the keyboard does not work?

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You need to change the battery.

HP 2 4GHz Wireless Optical Black Mobile Mouse


A number of suggested solutions.

Push the button on the base (not the mouse, but the part that plugs into the computer) to re-establish wireless communication

Yep the correct answer is that the batteries are running out. Change them!

After I tried all the reset, new battery, reinstall software with no results I put it in my hand and slapped it really hard with my other hand and the yellow light went out and it works again. I'm not making this up! Spank your mouse.

This can happen when the battery's are starting to die. Replace the batteries and then test the device again.

It depends on the mouse. Sometimes the red light flashes to signify the processing of a command. If it is continually flashing, then you may want to replace the battery.

I still have the manual for my mouse.  Model number 64321.
When this mouse was manufactured it used NiCad batteries which developed a memory much more than the newer batteries.  The older NiCad batteries needed to be conditioned occasionally so Kensington provided a way to do that with the charging base. 
The red light is for indicating discharge status of NiCad batteries.
The red light will flash quickly when you press the battery discharge button on the bottom of the base.  This indicates that you now have 5 seconds to place the mouse in the charging base for battery discharge.
The red light will flash flash more slowly when the battery is being discharged.
After the battery is fully discharged, the base will then charge the batteries.
It should be noted that very few manufacturers of products that utilized NiCad batteries provided a "battery conditioning" feature.  Kensington was unique in this regard.  Battery conditioning allowed NiCad batteries to have a longer useful life.

Now maybe you can help me....  I lost my power supply that plugs into the USB connector.  If you have yours, can you tell me what the output voltage is and what the polarity is of the inner pin.  This will be marked right on the power supply base.  
I plan to just get a generic power supply from Radio Shack, but I need the voltage value and polarity.  Until then, I can still use the mouse, but it won't charge.  FOr now, I'm just using standard AAA batteries.
Thanks.
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Most wireless mice will hibernate after a short period of inactivity. If something bumps the desk or moves the mouse it will start scanning again. If you don't like the light, you could try a laser mouse (no red LED flashing).