The term “battery caravan” can refer to two things:
The battery that supplies power to the electrical appliances in a caravan (also known as a touring caravan, travel trailer, or camper trailer).
A portable music player called Saregama Caravan.
For caravans, the battery is typically a deep cycle leisure battery, designed to provide sustained power over a long period. Deep cycle batteries are different from car batteries, which are designed to deliver a short burst of high current to start an engine. Leisure batteries come in two main types: flooded lead acid and absorbed glass mat (AGM).
The size of the battery you will need for your caravan will depend on the size of your caravan and the amount of power you expect to use.