Low Battery Beep Tone

[PACEARROW]

I get a low battery tone and then "shut-down" when the battery source is still providing a 4.3 volt supply ( under load). Does anyone have a schematic for a TrunkTracker II 245XLT so I can find out what triggers this Beeper and shut-down. I think it could be either an adjustment or a bad resistor. Any help will be deeply appreciated

 

[bwhite]

Since the 4 batts are supposed to be 4.8 volts why do you think 4.3 shouldn't trigger the alarm if shutdown is imminent? Sounds like it is wad (working as designed). I usually get < 10 min out of mine at a low volume once the beep tone starts. I've never been impressed with the runtime even on the 2300 mah batteries I have in it now.