I have a Bass Buddy for a fishing boat and I love it. I run a 34lb Minn Kota trolling motor on it. I need a fish finder on my boat ,but can I run the trolling motor and fish finder on the same batterie. the batterie is a Batterie Plus multi-purpose, marine starting, Deep cycle batterie. or do I need another batterie. Keep in mind my boat is only 8feet long I need all the space I can get. I also fish about 6 hours or less at times. Please help!