An RV uses a lead acid battery. This type of battery uses plates made of lead or lead oxide submerged in a solution of water and sulfuric acid, which is an electrolyte.
Lead acid batteries store electricity, so the amount of electricity a battery is able to store, depends on the size of the plates and quantity of the electrolyte.
RVs use different types of batteries. The type of battery used for supplying electricity to an RV is called a house battery. This type of battery should be a deep cycle battery, which provides a stable supply of electricity for a long time.
The two types of deep cycle batteries are the valve regulated lead acid and flooded lead acid batteries. Flooded batteries are the most common.