The only way to tell how much energy is in a bitcoin is to take it out of the Blockchain. Of course this means reverting a tx in the past, which would take more energy than you can ever hope have and time is also a factor.

A Bitcoin has so much energy it feels unlimited but there is technically a finite amount.

Also, I don't know anything, bitcoin isn't a battery, this is just stupid metaphors that Saylor insists on spreading.