Sorry to sound like a newbie but im new to the boating world, just bought a little 15ft-er. I was wondering how the battery remains charged- I have a 48hp 1989 I believe Johnson outboard on it. Is there a circuit in the engine that charges the battery as it runs or should I be worried about it being discharged as I plan to use the radio and fishfinder when the motor is and isnt running? <br /><br />My second question has to deal with a second outboard if the main one were to over stall in the middle of nowhere and not want to restart. I saw cheap trolling motors (around $100) and thought I could squeeze one beside the main outboard on the transom in an emergency situation to get me to shore, but I just learned that they were designed for freshwater use only and cannot be used in saltwater. Is that true even for an emergency situtation? Like once in a couple of years? And at other times it would be stored in a dry place. What would happen?<br /><br />Thanks