Personally, I spend as much time as possible out on the lake trolling.
The reason we usually come head back is that the battery is low. I
have tried the extension cord to the boat in the past. One day - much
to my horror - I had unexpected visitors - about five young boys who
were playing in the water, on the boat, while the charger was on.....No
one was hurt, but the episode makes me fear the extension cord idea.

Also, could you use a regular kind of extension cord, or do you need
some heavy duty cord to go that far? Thanks for any suggestions.