Relatively unchanged over the decades, 12-volt batteries come in two varieties: starting and deep cycle models. The former provides a high burst of power for a short time, while the latter offers a steady stream over longer periods. Differences in their chemical composition and internal construction means they cannot be interchanged.
Safer than wet types, gel cells and AGM batteries are ideal for many applications, including solar. Satisfy your power needs with reliable 12-volt batteries.