Why would you turn down the opportunity for free batteries? You'll be helping reduce waste too...

People will probably throw all kinds of random trash you don't want in there though...

Normal? Not at all. But there are others out there, and we have so many unfinished projects that we are working on too.
I like the vape idea, that is fucking brilliant. And it's probably for the best that you restrain yourself, because if you don't, then it will get really expensive... Once you can power all your small projects and have a "limitless" supply of batteries, you'll realize all of the things you can do with a shit ton of batteries, like you can buy an entire kit to electrify a bike, motor and all, for like $150 on Amazon. But then you'll need a charger that can grade your batteries so that you can build packs, and you'll need a spot welder, and nickel strips, and kapton tape, and some thick wire, and decent microphone and a cell phone camera stand and... What? The mic and camera stand? Well you might as well document the project and put it on YouTube. If you're lucky it could take off, but if not you can at least write it all off on your taxes as business expenses. What stuff would be worth writing off? Well the computer and the 3d printer of course. You're going to need those to design and print the battery case, and also edit the videos for YouTube...

And if all of that seemed logical to you, then you might want to get tested for ADHD, or Autism, because you might be on one or both of the spectrums, like so many of us here on Lemmy.