Add 300A Cold Discharge to the specification then. It should all be on this: http://www.bannerbatterien.com/banner/produkte/batterien/starting_bull/index2_en.php.

I have not had any problems with my cars battery (yet) but I usually leave it hooked up to an Optimate conditioner. I now have a HD rectifier which probably helps too as it has been boringly reliable, the best kind of reliability.