The dad who drives places where nobody is coming to help
What it is
A 1000 amp lithium jump starter rated to petrol engines up to 6.0 litres and diesel up to 3.0, with reverse polarity protection and a USB power bank.
Why we picked it
It is the single most useful object you can put in the boot of a car that goes anywhere remote, and it is the classic case of something everyone means to buy and nobody does. Reverse polarity protection is why this brand rather than a cheaper one: the failure mode of getting it wrong is expensive.