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Does a leisure battery which is connected to alternator, suppose to charge up whilst being plugged into a cool box, whilst driving. In other words does it re-charge and discharge at the same time.

Went on a 120 mile journey with cool box plugged in, upon arrival, my battery was low and small spot lights gave up on me ?

The battery in new.

On return journey, battery seems charged up as did not plug anything in !

Any helpers, thanks.

Not sure how the charge is split at a different rate between leisure and main batts? Mine charge at the same rate from the alternator with the engine running, as the output is just split to both batts.

Billy is correct in saying that electric cool boxes flatten the batts quickly.