A leisure battery is used in a caravan or boat. It differs from a car battery in that it is designed to be slowly discharged & will not deteriorate so quickly if left partly charged. A car battery can be used as a leisure battery but as it is designed for a large fast discharge when starting car followed by a fast charge it will deteriorate much quicker when used as leisure battery.
You could of course use a leisure battery in a box in your tent & recharge it when you got home.
A leisure as sold by caravan shops is basically a reinforced car battery not a true deep cycle battery which is more expensive.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets