The difference between starting and deep discharge batteries

Short version

Starting Batteries
*These batteries deliver a large burst of power for a short time as needed for normal engine starting. Not designed to withstand multiple discharge/recharge cycles and draining can significantly shorten its life.

Deep-cycle Batteries
*These batteries are designed to provide a steady amount of current over a long period of time. Can be repeatedly discharged and recharged without causing damage or shortening their life. (within reason)