Travis designed a circuit that allows for three different loads (967, 27.2 and 2.2 Ohms) to be placed on a battery. Primary use is to determine the internal resistance of a battery. As a battery ages, the internal resistance goes up. The intention is to capture (and graph) the voltage drop for each load then, sometime later (say a year), do it again. What you're looking for is a significant change in voltage drop year-to-year to evaluate the health of the battery under test. We captured both batteries (main: .0726 Ohms, aux: .0942 Ohms), and will do this again next year. We (Travis, Darren and I) spent most of the day tinkering with building the tester into a small test box. It was lots of fun!
