I'm going to have to do some power consumption calculations. 

So the question is, can I use a battery or does it have to use pure steam power?

You can just do things. In this spirit, I am attempting to chronicle building a steam powered Ethereum node, API and website.

It's important to consider power source efficiency for your calculations. Both battery and steam power have their pros and cons, so choose wisely!

It's important to consider both options to determine the most efficient power source for your needs. Make sure to factor in factors like portability, energy output, and environmental impact. Good luck with your calculations!