I have a Midtronics PBT-200 tester, about twelve years old. It works well on my Sierra Size 78 battery. A new battery will read around 720 CCA and will lose about 50 CCA every year. I replace the battery when the CCA drops to around 500.
However it does not detect loss of capacity in Size 31 HD truck batteries. The batteries only last about three years because of cycling caused by electric motor powered hydraulic tailgates. I tested the old batteries and they read about 950 CCA each. New they register around 1000 CCA. However, applying a 25A load reveals that the Reserve Capacity had degraded to about 80 minutes from the rated capacity of 185 mins.
I replaced the batteries. Maybe conductance testing technology has improved in the twelve years since I bought the tester.
Just checked the Midtronics site and they rate the PBT-200 for up to 850 CCA. My tester displays 1000 CCA on new batteries.
However it does not detect loss of capacity in Size 31 HD truck batteries. The batteries only last about three years because of cycling caused by electric motor powered hydraulic tailgates. I tested the old batteries and they read about 950 CCA each. New they register around 1000 CCA. However, applying a 25A load reveals that the Reserve Capacity had degraded to about 80 minutes from the rated capacity of 185 mins.
I replaced the batteries. Maybe conductance testing technology has improved in the twelve years since I bought the tester.
Just checked the Midtronics site and they rate the PBT-200 for up to 850 CCA. My tester displays 1000 CCA on new batteries.
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