Test Equipment-these products are used to determine how much power the battery has compared to their new power ratings, this can be done using resistive load technology that simply measures a small amount of current passed through the battery or with carbon pile technology that simulated an actual heavy load placed on the battery.  Some equipment is designed to test engine-starting batteries for Cranking Amps or Cold Cranking Amps while others are designed to test Deep Cycle and Traction batteries for reserve capacity.