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Double Bass Passive preamp?

Every time you change the battery, write the date on it with a sharpie, also write the date on a piece of masking tape and tape it to the bottom of the preamp or inside of your case or your music stand or whatever travels with you to your gigs. I learned this trick for the battery in my EB. Also works for electronic tuners, etc.
-JK
 
My own $0.02 here -- you could let the battery clip dangle outside the preamp enclosure, and attach a battery with a big rubber band. On my DIY preamp, the battery compartment is on the outside of the unit for easy access.

The rubber bands used to hold bunches of broccoli are just right. And you like broccoli, don't you?
 
My wife was, as a child, forced to eat broccoli. She promptly puked. Broccoli is now an inside joke w/us(welcome in).
On topic, dangling wires & rubber bands would go well with the ghetto-looking piezo installation & horrible strip job someone did to this poor bass. I think I'll try it.
 
I'll try & get some up in the next few days. It's just a piezo element- roughly the size of a quarter wedged w/a scrap of wood into a gap on the bass side of the bridge. Two wispy wires connect to a jack attached to the E & A strings. Looks bad, can be made to sound good.