[Elecraft] BEEP

[Richard Thorpe]

I was sitting at the operating position earlier today and kept hearing a "beep" about every 4 to 5 mins coming from the K3.  I run the K3 off a car battery charged by solar cells, lately there has been no sun. I checked that the battery and the voltage is at 10.4 volts.  Is the beep a "low voltage" warning from the K3? I couldn't find any reference in the manual.
Thank you.

K6CG