i got a small jon boat that i used to fish our pond with. pretty basic have to use oars to get it around. well me and a friend took it up the river and dropped it in a few miles upstream. so we floated and rowed down and fished. worked ok, but theres no turning back! i was wondering if an electric trolling motor would be enough to push a small boat up a decent river current? i cant afford a gas motor there ridiculously expensive and my girlfriend would kill me if i bought a motor and not a ring. how long does a trolling motor run on a battery? and do you have to buy a certain kind?