As mentioned by KENTOFNSL I have heard of issues with Battery being drained by use of newer, multiple and or "high powered" electronics.
Many of the fishing professionals are using a dedicated battery now to power their electronic ONLY, finders, gps and 360 degree scanners. Often they only run the main motor to get to a spot and then fish ALL day using an electric motor. So the big motor is not charging it enough to cover what they have depleted. Also I have heard that a separate battery can help eliminate any potential interference that can occur when hooked to the same battery as your running motor?
In my boat I run a switch like Dubob showed. I have 2 AGM 12 V deep cycles batteries. I have a Single GPS Lowrance Finder that is hooked up through the switch. When I'm running and or trolling with my 50HP 4 stroke I keep it on both batteries and it charges them while I run or troll. If I am fishing using my electric 55 LB thrust 12 Volt to fish I always use battery 1 or 2 alone. So if I happen to drain one too much I always have a strong starter battery. I can fish for usually at least 3 or 4 days on the water and have good battery life to run everything by charging them from main motor while running and or trolling. I usually never have to worry about charging them. When I get home I set it to Both and charge them in that setting, the batteries are usually so close to fully charged that they are good to go in a few hours. I use an Auto charger that will stop charging and just maintain. I got it at Harbor Freight for about 30 Bucks' It has worked great for many years with no issues. In the winter I keep them hooked up to a trickle charger (harbor freight under 10 bucks) and they are good to go in the spring. These batteries are about 6 years old and still going strong with lots of use. This is a smaller 17 foot aluminum boat so It might not work for others but this has worked great for me for years.
Mildog out
Many of the fishing professionals are using a dedicated battery now to power their electronic ONLY, finders, gps and 360 degree scanners. Often they only run the main motor to get to a spot and then fish ALL day using an electric motor. So the big motor is not charging it enough to cover what they have depleted. Also I have heard that a separate battery can help eliminate any potential interference that can occur when hooked to the same battery as your running motor?
In my boat I run a switch like Dubob showed. I have 2 AGM 12 V deep cycles batteries. I have a Single GPS Lowrance Finder that is hooked up through the switch. When I'm running and or trolling with my 50HP 4 stroke I keep it on both batteries and it charges them while I run or troll. If I am fishing using my electric 55 LB thrust 12 Volt to fish I always use battery 1 or 2 alone. So if I happen to drain one too much I always have a strong starter battery. I can fish for usually at least 3 or 4 days on the water and have good battery life to run everything by charging them from main motor while running and or trolling. I usually never have to worry about charging them. When I get home I set it to Both and charge them in that setting, the batteries are usually so close to fully charged that they are good to go in a few hours. I use an Auto charger that will stop charging and just maintain. I got it at Harbor Freight for about 30 Bucks' It has worked great for many years with no issues. In the winter I keep them hooked up to a trickle charger (harbor freight under 10 bucks) and they are good to go in the spring. These batteries are about 6 years old and still going strong with lots of use. This is a smaller 17 foot aluminum boat so It might not work for others but this has worked great for me for years.
Mildog out
time spent fishing isn't deducted from ones life