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I have an iPhone SE and I have noticed the battery drainage is quicker when outside and in the winter.

I have heard some websites and people say that batteries drain faster in cold. Is this true?

I know another reason it could drain faster outside is because I’m using Cellular Data and not WiFi.

One quote I found:

When lithium-ion batteries are exposed to cold temperatures, their performance suffers. When cold, a phone battery can drain faster than normal, or it might say it has ample power remaining and then suddenly go dead.

My phone has recently saying it has ample power and then turns off like it said in the quote.

Is this true and is there an official statement from Apple?

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Yes - run times are shorter when the battery is cold.

Apple has this to say: - https://www.apple.com/batteries/maximizing-performance/

When using your device in a very cold environment, you may notice a decrease in battery life, but this condition is temporary. Once the battery’s temperature returns to its normal operating range, its performance will return to normal as well.

On a technical level, the drain is what the device uses and that doesn't change with the temperature being low. The ability of the battery to produce current and voltage is impaired only while it's cold. The charge is still in the battery, just can't flow as fast. Think molasses, but less dramatic in the cold.

To be even more precise, it's not physics like molasses, but it's the actual chemical reaction providing power slows down in the cold to deliver less than enough current to power the device.

(Reference)

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