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This doesn't make sense. By that logic, a lithium battery the size of a house wouldn't be able to power an LED.

If you have two lithium batteries which are identical with the exception that one is double the capacity, the larger battery will be able to provide double the current at the same voltage and thus double the power. Lithium batteries are rated for current draw as a multiple of their capacity.

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It's nothing to do with the size of the battery it's with the chemistry and yes a batter the size of a house might very well not be able to power a single LED because of its internal resistence.

Lithium batteries are rated for current draw based on their chemistry please do some basic reasearch.

And no if you have 2 identical 18650 they'll have the same density and sustained and peak current draw if not they are not identical.

Cell size, chemistry, internal resistance, breakage and short currents etc are all variables based on the exact make of the battery.

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