Do you unplug the bass when you aren't using it? The batteries wont drain then.
I've been using batteries in most of my basses for over 20 years and I have never had batteries go dead on me. Once one was weak because I left the bass plugged in for a week... so it clipped a little.
If the batteries are draining that fast, and you unplug the bass when you are not playing, there's either short somewhere (sometimes the battery wire on the output jack can short to the shielding) or you have a bad preamp.
Nothing in that preamp draws that much current for you to be having that problem.
And don't use zinc/carbon batteries or nicads.
I've been using batteries in most of my basses for over 20 years and I have never had batteries go dead on me. Once one was weak because I left the bass plugged in for a week... so it clipped a little.
If the batteries are draining that fast, and you unplug the bass when you are not playing, there's either short somewhere (sometimes the battery wire on the output jack can short to the shielding) or you have a bad preamp.
Nothing in that preamp draws that much current for you to be having that problem.
And don't use zinc/carbon batteries or nicads.