So it's well known that some pedals sound good/interesting when the battery is dying.
There's even dying battery simulators on the market now.

I'd like to know which pedals you think offer the most interesting or different/weird sounds under this voltage starvation? Accompanying sound descriptions if possible please.

Thanks

heard about using carbon zinc, but never dying batteries. I'm going to save my old 9 volts and put them on ebay for 5 bucks each. Players will need 3 or 4 for one gig

If this is true, why not just use like an 8-volt adapter? Dead battery all night long.

Dwarfcraft Devices SheFuzz/Shiva.

Dwarfcraft Devices SheFuzz v2 | Chicago Music Exchange

An EQD Dirt Transmitter will probably give you what you are looking for:
">>> . . . The “Bias” control starves the transistors of necessary electrical current, resulting in a gated, or “dying battery” sound for space-age Velcro-like fuzz tones. . . . This causes a primitive, sputtering, grimy effect akin to vintage (by Earthling standards) analog synthesizers . . . <<<."
Dirt Transmitter — EarthQuaker Devices

the H9 fuzz has a sag function that does something similar

My fuzzhugger algal bloom has a Starve knob that mimics a failing battery. You can dial it in to taste. Cool sounds in that box.

The smallsound/bigsound mini does great dying battery sounds with the bias knob.

smallsound/bigsound

Voodoo Lab Pedal Power 2 has two outputs with adjustable voltage, as some pedals get cranky when battery power is low. My old Ibanez SC10 Super Stereo Chorus would get glitchy on low battery, but then it would stop. So it depends, but I think you're on to something with used batteries on eBay to guitar players....

I actually had to replace a 9V in a pedal the other day- for the tuner for our bass player, who didn't realize that unplugging the cable on the instrument side kept the battery from running down...

ZVEX Fuzz Factory, Whipple Baby Tooth can both get that sound. Also check out some of the fuzz pedals from Death by Audio.

Ibanez FZ7 at low gain with damage turned on. It's cheap.

The EHX Germanium OD can simulate a dying battery. It has pots for voltage and bias adjustments. It can produce some interesting sounds but I've personally never found much use for it. The voltage/bias pots is a very interesting idea but the basic sound of the pedal is just a little... boring. It doesn't get interesting before the sound is REALLY messed up. And that's not a sound you will need much.

Definitely try before you buy, or get a used one cheap. With careful adjustments it can sound a lot cooler than every youtube video I've seen of it (they all make it sound like a complete POS) but it still has a VERY limited range of usable sounds, unless you're looking for a sound that's extremely lo-fi, fizzy, blown out, no sustain whatsoever, etc.