An automotive or commercial starting battery is manufactured specifically to shallow cycle thousands of times while only being able to deeply discharge less than 50 cycles during its life. A cycle refers to one battery discharge and recharge of any depth. These terms help us to understand the type of cycling that batteries are required to experience.
Shallow cycles occur when only a small percent of the total capacity of the battery is discharged.
Moderate and Deep cycles are discharged by a higher percent of the total battery's capacity.