so I have been playing some Metroid recently and wondered if there could be a good reason why Samus would be fat (other than my preference). I think I have one reason and I want to know if you think it’s a reasonable one.
the fat would be used as a bio-battery.
before I did any type of research I thought this would be a dumb reason. but there could actually be some benefits to it
weight isn’t a huge deal if you have power armor, the biggest factor in how much energy you can store is space. body fat has an energy density of 35 MJ/L (Mega Joules/Liter) and current batteries can have an energy density of 4.32 MJ/L. (I read somewhere that theoretical batteries could be 5x better which fat still beats)
there are also some fish that can produce electricity and apparently the cells that do it are modified muscle cells. so if genetic engineering is a thing then it probably shouldn’t be too difficult to modify some muscle cells into the electrical ones
(and also improve the body’s fat to energy conversion from 22-ish% to something better)
there are more energy dense materials but they have some problems
plutonium is the most energy dense at 1,700,000,000 MJ/L
why you wouldn’t want a nuclear reactor inside your power armor I let you figure out
the densest non nuclear option is boron at 137.8 MJ/L (if you must use traditional fuels , then diesel is the best at just 38.6 MJ/L). I’m assuming you maul it into a powder and burn it (like you would with iron) to get the energy out but I can’t be sure.
what could be problematic is if there is a critical failure in the generator (because you are getting shot at) that might cause an explosion or uncontrolled fire because you are carrying a bunch of fuel and oxygen. the generator itself also creates a lot of heat and pressure, that might make that critical failure more likely to happen. it could also create weak points because (I assume) the heat and pressure needs to go
somewhere for it to function properly.
if that is true then it would mean that the suits with generators need more and bulkier armor for the similar protection. then the fat option would be the quick and nimble armor type for a change, especially if the material the armor is made of is really heavy to begin with.
there is also the added weight of a generator but in the future they can probably be really small and still produce a lot of energy efficiently, but it is something to consider
if you like the idea that being fat is being quick, you could have the generator use a fuel that has a poor energy density by weight relative to fat (38 MJ/kg) like aluminum (31 MJ/kg 83.8 MJ/L) or iron (5.2 MJ/kg 40.7 MJ/L)
I might be under or overestimating the problems with having a generator in the suit. I don’t know enough to say if they work like I think or I am way off. hopefully some of you know better or can see something I haven’t considered.