Ive seen them on ebay for $850. Seem premium too. From a company that has been around for 12 years. I wanted to get one for my boat, but they are the wrong siz

Ive seen them on ebay for $850. Seem premium too. From a company that has been around for 12 years. I wanted to get one for my boat, but they are the wrong size. They seem to make them longer, instead of wider, so can't drop in replace the 2x100ah I have now.