so im new to this stuff just got my first boat the little pelican bass raider from academy.. 

i also grabbed the garmin 9sv echomap.  ive got a big dc battery for my trolling motor.. 

im wondering about a a battery and maybe use one just to get me going..   

i was looking at the game winner deer feeder battery at academy its a 12v 7ah battery for like 20$ 

they have a charger also  anything else i have found i need to order its not goign to be in fast enough

i leave sunday and wont be able to use my stuff untill 3 weeks from

now when i get back from work i travel with my job gone 3 weeks out of the month..  

was curious if this would work in a pinch just to test stuff out or maybe a motor cycle battery? 

There are formulas out there that will tell you what you need for the hours you fish.

 

That battery should work fine for 4.5 to 7 hours.  Personally,  I would try it with the trolling motor battery.  You might see some interference when the trolling motor is running.  If that’s the case then get another battery for the fish finder.

thanks well i just thought it be best to get the  seperate battery for the fish finder avoid any issues lol

i may just try the feeder battery and see how it goes prob not going to be out more than 4 hours or so anyway

I use a 7ah battery for my fish finder.  I've never had issues with it.  If I'm planning on being out on the water longer than 7 hours, I turn it off when I drop anchor somewhere.

 

What kind of trolling motor do you use?  Typically, only the ones with variable speeds create issues.  If the motor has set speeds (like 5 forward and 3 reverse), then it shouldn't create any interference.