On 10/05/2021 10:47, T i m wrote:

Whilst it may start off with less Ah capacity, it may well have a
greater cold cranking current so more likely to start a car, assuming it's willing to start easily.

There is a Youtube video showing cranking when these boosters have been
refrigerated down to 0C

With a lithium based booster on the first turn of the key little
happens, the same with the second turn of the key but these two
operations have generated some heat within the battery and subsequently
the engine cranks with relative ease.

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