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Since battery power involves electricity, I guess the question should be "Is battery powered more efficient than mains (or grid) powered?".

Battery as well as grid, is a way of transporting electric energy. So the question is which is more efficient.

At first glance it is easy to say that transportation via grid can be as high as 99,9% efficient when the distance is no more than 100 m, and can be as low as 88% when the distance is at the range of 1000 km.

The efficiency of the transportation of the electric power via battery is maximum at the range of 90% (since there is always at least 10% of the power left in the battery).

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15y ago
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10y ago

That's not always true.

Batteries can be moved around more easily than extension cords, but batteries run out eventually.

So, for small, movable things batteries are better, but for stuff that has to run a long time, and/or uses a lot of energy, mains are better.

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Q: Why is a battery more useful than main electricity?
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