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Philip,
Not sure because the batteries are linked. I know that the ABS system draws some current and have checked all my fuses for unusual current draw.
The rear battery has a small current draw from the navigator.
I'm guessing that the main battery would have a higher draw from electronics (this has been documented before but the fix was a little too technical for my skill level)
I had not thought of using an AGM as a main because I was under the impression that the Disco needed a higher capacity Calcium battery. I had tried a CAT deep cycle/cranking battery but it did not last that well and I went back to the Calcium.
I might have to do some research on why the Disco requires a Calcium battery.
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Odd.. The appropriate CAT battery is Calcium..