Just got a new AT Pro. The battery indicator appears to be flakey. Sometimes shows all bars, sometimes none. I know a call to Garret is probably warrented, but has anyone run across this? New charged nicads do not eliminate the issue.
I don't think nicad;s are the correct voltage. You want 1.5 volts not 1.2 volts. That's real close to the cut-off voltage.
I recall some batteries that did not fit right in a laser I had. I think they might have been "Ultra" (Duracell, I think) They were just a tiny bit too small and did not make good contact. I would try some new standard alkaline AA"s.
Also make sure battery is installed correctly in the detector (look at photo in the manual).
I am going to design and build a 5 cell, C size battery pack that is fully waterproof to ten feet for my atpro. Pics soon. No, really.
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I see you are serious. That's a good idea. I may have one to add to it.
Is there a way to use that empty battery slot to add another battery without upping the voltage? That way it will last all day without running outta juice. I forgot if its in series or parallel.
Did you try to do a factory reset?
It's on page 11 of your owners manual.
It says to press and hold the power button for 5 to 10 seconds ( until the detector produces a fast double beep).