dont use it if they are deep cycle.
if they're crankers.
set the amps to the CCA or CA of the battery, plug it up and test hold the test for 10 seconds and it'll be showing the terminal voltage under load. if terminal voltage under load is over 10.5v the battery is ok.
double check the accuracy of the volts meter on it or piggy back a known accurate multi meter onto the batteries. If you have a clamp meter it can be useful to hook that on as well to make sure the amps you're pulling are whats on the dial.
wrong model... (pics were very slow to load)
try this.
hook up the battery
wind the knob clockwise until either A, the volts gauge drops below minimum or B, the amps gauge hits the CCA or CA of the battery hold it for 5-10 seconds and then back off, wait for 2 minutes and then test your next battery.
if A happens first the battery is not up to speed.
same caveats about double checking with meter and clamp meter.
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