What is battery cycle life?

One cycle of a battery is a dischargefrom full charge to full discharge and a return to full charge again. The totalnumber of cycles a battery can perform before failure is called its Cycle Life.Moat battery manufacturers will not discus the Cycle Life of their product.Many advertised Deep Cycle batteries have not been tested, or, which is thecase with cranking batteries, were never designed for long Cycle Life .