Not sure where the stock battery is located in your X10. I have a 98 Maristar and when I first added a second battery I had it in the back next to the engine on the passenger side. When I switched to bigger ballast bags in the backÖ yep the battery was in the way when I tried to fill my ballast.
Itís an easy move. You can buy cables in different lengths and put your batteries where you want them. I now have 2 batteries under the rear seat. One on either side.
I got my cables from the local Interstate Battery distributor but any auto store should carry them too. Good luck.