I have an LR4-03 and it has an external beeper - however that beeper beeps at the same time my Tx is enunciating my low voltage warnings I'd set up in ETX.

Is there a way to stop that - so that the external beeper only sounds off at loss of battery?  

Other than lowering or disabling the BF low voltage warnings on the BFC batt tab?

Beeper configuration is probably easiest, but you could also try unplugging the buzzer wire (leave 5v/gnd).