This one deserves the full sub treatment, there's too much potential to cover in a mere 100 words when it comes to something so complex.
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As a inspiration for a quick window dressing in a scifi setting it's good to go, but I would dearly love to see more of this, it's the start of something special.
This is a cool idea. Strangely I think this was too long...
The idea of the 100 word post (as I understand it) is to give the skeleton, and let others flesh it out in their mind, or in their setting.
Great idea, I just think it could be better refined into a 100 words or better expanded into a longer post.
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Also, I think you meant that instead of the in the first line.
Clever concept. I was thinking that these could be used to grow crops in the vacuum of space. Basically infinite farmland. But it looks like you're shooting at a source of O2 and sugar (and possibly energy). That's actually a really cool idea, but why can't we have both? Green Sleeves seem more than capable vessles to accomplish food, oxygen, and energy.
I can think of a great number of uses for something like this, the first that comes to mind is as the power source for navigational beacons and bouys around star systems and and for interstellar travel. The power requirement to just run a basic ping is pretty low, and if it has a few capacitors it can charge up and release fairly 'loud' navigational pings. Some other ideas include powering scientific observation satellites, the sort of thing a starship would zip up and kick out and move on, while scientists elsewhere receive and decipher the data. Good thing for long term observations, or for providing satellites to frontier level worlds and colonies. It doesn't carry a lot of data, but a satellite with a bucky core could serve as the seed of global communications.
You've managed to make the battery novel, not an easy task.
I could see them used as an auxilliary battery in starships, something equivalent to having a second battery in your car to power just the lights. Although, in the case of spacefaring, it would be better served as life support. The incredibly long lifespan would mean that even used-spaceship buyers wouldn't have to worry about replacing them.