I've noticed that you can but these direct from the manufacturer for around $240. Looks like you can contact them if you need to add a self warming feature for arctic starts. This one weights in at 13lb or 2.2kg.
https://www.aliexpress.us/item/32568...yAdapt=glo2usa
I purchased a cheaper one last year that matched other vendor's specs - except for the most important one which was cranking amps. So I have a very nice bench battery and a 12v source in a power outage. But for my other fellow bargain hunters, make sure what you buy has a rating for 800 CCA or higher.