Question for the battery experts on here.

Recently installed a MEGA360 on my boat and all of a sudden Im having battery issues like crazy. Hard to get in a full days fishing without the cranking battery having to be jumped. I've talked to a fishing buddy who had the same issue when he installed his Livescope and he's installed a 12V Lithium specifically for the Livescope and is running everything else off the cranking battery like normal.

Ideas, thoughts or suggestions? I've got 3 big tournaments coming up this month for my high school team and we nearly had a disastrous situation bite us in the back side with a bag of fish that qualified them for the State Championship and the cranking battery dead in the water. Luckily, I carry a set of cables on the boat and was able to get a jump to refire the system.

Thanks in advance for any assistance.

James