These dual-purpose batteries provide a surge of power to start automobiles and other vehicles, and they deliver power over a long period of time. They're deep cycle, so they can handle many charge/deep discharge cycles. Because they are wet-cell batteries and contain electrolyte in an unsealed container, they must be mounted upright. They may occasionally need to be filled with distilled water.
Reserve capacity is the number of minutes that a new, fully charged battery can continuously discharge at 25 amps at 80° F. Marine cranking amps is the maximum amps that a new, fully charged battery can continuously deliver for 30 seconds at 32° F.
Warning: Batteries should always be charged and discharged in a ventilated area.