This device is used for evaluating the performance of batteries under load. It employs a variable resistance, created by a stack of carbon discs that can be compressed to adjust the electrical resistance, simulating the demands placed on a battery by a vehicles starting system or other high-current applications. As the resistance is adjusted, the voltage output of the battery can be observed under varying loads, offering insights into its overall health and capacity.
Employing this testing method offers several advantages, including the ability to assess a battery’s real-world performance without relying solely on open-circuit voltage measurements. Its use dates back to when automotive electrical systems became more complex, necessitating a more rigorous method for evaluating battery function than simple voltage checks. This type of tester offers a relatively inexpensive and reliable means of determining if a battery can handle the substantial current draw required for starting a vehicle or powering heavy electrical loads.
