It is not a battery in the physical sense because it does not store energy. What it does is, it allows you to transfer the economic utility of cheap local energy to regions where energy is more in demand. Although, as the article itself highlights, this could also be done more efficiently with aluminum smelting, and other processes that are energy intensive but don't require much infrastructure. From a purely financi…
Yes it does. It stores what is called "monetary energy", and monetary energy belongs in the same class as kinetic, elastic, and chemical energies.
One of the key differences between bitcoin and other monetary assets is that bitcoin is absolutely scarce (the first absolutely scare monetary asset in human history), so its energy cannot leak via inflation.