A lead acid battery with full rated capacity, will provide ONLY 85% of its capacity at that temperature. Your 350 CCA rated battery is shown by your meter to be at almost 100% capacity? Hard to believe, at that temperature it should be about 297 amps. or at 85%, and test at 350 at 80 degrees F. At that reading and temperature, the battery would be 350+ 52.5 amps which is more then 400 CCA, increased capacity @ 80 degrees F.? I don't know what else to say, except that I am not convinced. Take your OLD carbon pile tester and do tbe same test do it with temperature compensation. At 32 degrees F for example you load test that battery @ 1/2 of its 85% capacity or 150 amps. I will wait for your result and post, although I know what the answer already. Maybe I'm wrong!
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