9V batteries are the worst, given that they have the poles on the same side, right next to each other. For some unfathomable reason they are used in smoke detectors, so people buy a bunch of them, change the batteries in the smoke detectors, and toss the rest of the batteries in a drawer.
Then a fire starts when something shorts a battery. I don't think that was the point of the smoke detectors. They should be redesigned to use safer batteries.
The flat 4.5V battery has been discontinued for use in new devices, because it was so easy to short (and enter the wrong way). The 9V needs to go too, or at least be sold with a plastic cap on each individual battery.
Being a musician, especially a guitar player, I've always had 9V batteries in my gig bag. I'd keep them wrapped as they came from the store and toss the dead ones in the trash. I agree that side by side terminals are generally a bad idea.
Technology has replaced foot pedal use for many of us. Nowadays, many amps have such good effects we don't need them, although lots of players still carry a boxful of floor effects around just because they've paid big money for them and continue to prefer them. Once you have a stack of effects it makes sense to mount them in a case and buy a 9V power supply and hookup cables to replace all those batteries.
Technology will lead to the death of the 9v over time. I use a tube hybrid amp that has something like 23 effects that rival the best of the standalone stompbox and rack effects. I'm done with 9v batteries on stage or at home, except for the 9V that's in the Carbon Monoxide detector in our house.
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