You might get more response if you posted this in the D3-D4 forum
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The bloody things don’t have enough capacity anyway, don’t know what I was thinking. They were in an ARB battery tray with heat shielding form exhaust manifold, V8 engine.
Am going to sell the battery tray and put a descent sized battery in the rear. One I can pull in and out easily, so I’m not lugging it around for the other 46 weeks of the year I don’t go camping.