Regular Car's Battery is designed to provide very large amount of current for short period of time, to crank the engine! Once the engine strats, the Alternator (Generator) provides all the power the car needs.
So a car battery may go through its entire life without ever being drained more than 20 percent of its total capacity. To accomplish this, a car’s battery uses thinner plates.
Inexpensive and easily available.
Deep Cycle Battery is designed to provide a steady amount of current over a long period of time. A deep Cycle Battery can also provide a surge when needed.
A deep cycle battery is designed to be deeply discharged over and over again, something that would ruin a car battery very quickly. To accomplish this, a deep cycle battery uses thicker plates.
Slightly expensive than a car battery, easily available.
Very light, but extremely expensive!
Aging is a concern with most lithium-ion batteries and many manufacturers remain silent about this issue. Capacity deterioration is noticeable in one year, whether the battery is in use or not.
Hard to find exact replacment due to variable shapes, 7-10 times the cost of a Deep Cycle Battery of similar specs.