How long will a Deep Cycle battery last on a single charge?

Discharging batteries depends on several factors. These include, but are not limited to, the initial state of charge, the depth of discharge, the age and original capacity of the battery, the load or rate of discharge and the temperature at the time of discharge. To estimate the cycle time at 70° F (21.1° C), divide the battery's ampere-hour rating by the load or discharge current in amps. For example, a new 72-ampere-hour battery with a 10-amp load should last approximately 7.2 hours. As the battery ages, this capacity will be reduced.