I connect to my TEN TEC OMNI-V for deep cycle battery , however, I notice OMNI-V stop working at low voltage specially during TX at full power, due to voltage drop of battery. CPU go into shut down mode when input voltage go below about 10.5 V, radio has zenner diode, and CPU detect , radio is getting shut down, so CPU write last VFO, frequency, mode , etc into eeprom, and CPU shut down, to prevent this, I made modification as follow.