Just rechecked a few minutes ago with starter vehicle running and voltage measures 14.2 to 14.5 without cables hooked to Z4. And with cables in place, starter vehicle running, and measuring voltage on Z4 battery post voltage reads 14.2. Will rerun test in morning after it Z4 sleeps overnight. CAmps at 32 degrees is 850. CCA 680 at 0 degrees. More @Wikipedia
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