I just added a 5th battery in my Lynx. It’s a lithium just for running the graphs and active target at the bow. That way I could go with the smaller lithium and continue to run my console units from the cranking battery. I was able to put the battery and a 1-bank charger next to the gas tank on the starboard side. And it weighs about the same as the two power pole pumps mounted on the port side in this spot.
Sorry if this doesn’t help, I’m not familiar with the rear layout of the Cougar and this is my first Bass Cat. Have had it about 6 weeks. Good luck.
