2007~2015 CX-9 Smart Key Light...Flashing Red?

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2009 Mazda CX-9 GT
Searched the net and manuals but couldn't find my answer.

On the key-fob, the red led flashes at different rates, and I am curious on what it is trying to tell me. When it is communicating with the vehicle, it flashes every 6 seconds or so. This morning I noticed it flashing rapidly, about 3 or 4 flashes in a row. I suspect this may be "low key-fob battery"? I will test the battery tonight when I get home, but just wondering if my thought is correct.

And are there any other flash sequences that it might do?
 
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