Energy Storage

Metal air batteries have energy densities. But what is their main drawback in the context of their use in mobility?

They are very expensive
They use rare metals and scarce raw materials
They are not rechargeable
They are not stable during mobility

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Correct Answer
They are not rechargeable

And here's something for you to take back

Some of the most common metal air batteries that you would have come across are those used in hearing aids etc. (typicallt zinc air batteries), precisely for the reason that they have high energy densities and as a result even small sizes (that can fit in your ear!) can hold enough energy for a while

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