Unlike batteries used to start engines, deep cycle batteries are designed to store power. They have fewer and thicker lead plates as compared to starter batteries. Starter batteries are designed to provide a sudden surge of power needed to crank an engine, so there are more lead plates within these batteries and they are thinner, providing a larger surface area.
Deep cycle batteries are often used in marine vessels, RVs, motor homes or caravans to provide power to run electrical equipment and appliances. So you would need a battery that would store a large quantity of power, to discharge deeply, and to recharge over and over again.
There are three basic types of deep cycle batteries.
Lead Acid Flooded Cell
Lead Acid Flooded Cell batteries are the typical batteries that you see in most deep cycle applications. They are available in several sizes, in both 12v and 6v. They have very thick lead plates submerged in an acid solution (electrolyte). The majority of RV's or caravans use this type of battery.
Many RV's have two or more 6 volt batteries, wired in series and parallel to create a 12 volt battery bank. Golf Cart batteries are the primary example, and Trojan brand size T-105 is the industry standard.
Gel Cell Batteries
DOUBLE YOUR BATTERY LIFESPAN