No it isn't. The energy spent on mining is gone. I can't run a vacuum cleaner off a Bitcoin. Batteries store energy, Bitcoin is only a vote on how to spend energy in the future.
The disconnect is obvious every time the price of Bitcoin changes.
Discussion
The price of Bitcoin? What do you mean? A Bitcoin is a Bitcoin. What it will buy will always increase over time.
That isn't a given. Likely, yes, but not given. It depends on people wanting it. Lack for people or lack for want will decrease it's worth. Both are possible.
No currency can "store" anything but information. People are the only true wealth.