A leisure battery is a deep cycle battery specially designed to provide a low current for long periods. As you can imagine these are phenomenal pieces of kit and extremely handy for people switching off the grid.
How long your leisure battery will last off-grid is down to a few key things. The first is the capacity of the battery. The best leisure battery for an off-grid caravan would undoubtedly be a category A battery. These batteries are perfect for off-grid caravanning as they have a huge storage capacity that will help to power more appliances for a longer period.
The battery power reserve of a caravan is measured in ampere/hours. The apparent ideal size for an off-grid power reserve is 110Ah. This kind of battery is both large and heavy so it is important to know whether you have the space and the payload allowance.
If treated correctly a leisure battery should last around 5 years. However, if mistreated could last as little as 1 year. The main rules are to make sure that you do not let the battery run flat and to charge the battery monthly, regardless of whether it is in use or not.
It could be wise to invest in a second leisure battery, this is common amongst off-grid caravans as it gives them twice the capacity.