Originally Posted by nyca

I will get some photos tomorrow, my extension cable is arriving then and I will be putting everything together once I have that. But its simple really - get two thin M6x1.0 nuts and you will be able to sandwich the lug terminals at the battery without disturbing the factory nuts. That nut takes a 10mm socket. On the cable length issue, that Battery Tender cable isn't proprietary actually, you could buy a longer one with the same connections (Schumacher makes them for example) and avoid the extension cable, but since I already have the included one wired up, I am just going to lengthen it with their extension part.

Originally Posted by nyca

Here are some photos of the "second nut" approach with a Battery Tender product.

Originally Posted by Crusje

I bought m6 eyelets as the m8 eyelets that came with the charger went on my sedan. The negative nut barely fit and took a couple of tries to thread it in. Hopefully it doesn't come off with vibration as time goes on.