[Elecraft] Best Batteries for KX-3?

[Dennis W0JX]

I have just put my KX-3 into portable service trying to locate noise sources around my property and neighborhood. I put eight brand new Duracell alkaline cells into the KX-3 and turned off the backlight. Preamp is set to 20 db gain and I am using headphones with a homemade 26 inch loop for DF.

I am surprised with how fast the battery voltage is dropping as indicated by the KX-3 display. What batteries would be better to use for this application where I might be out for as long as two hours looking for noise sources?

73 Dennis W0JX
Milan, OH