No batteries from those sites are for general purpose automotive use. The closest are 4xspower which only have a race battery, they actually list their supplementary audio battery for our car??. Every other battery is for marine, motorcycle, or supplementary use, basicly nothing that you'll be keeping the battery out in a cold winter. Li batts have bad cycling issues, the more you use it the less capacity it will have, after a year of daily use you'll lose a large fraction of the overall storage capacity. None of these batteries have a heating or cooling system to maintain the correct operating or storage temps, our engine bays get very hot in traffic near 100C and this winter there were a number of -10C days both of which would be detrimental to a li battery. And hopefully no one will get into a collision that would damage the battery case on a rainy day, potential for a massive fire/explosion from all that lithium. They can be used for track days thats it and thats a big price tag for just track days.
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