hey guys sorry im still at the new bass boat ownership thing, but heres a question, theres no doubt my trolling motor is underpowered for the boat it is a minnkota edge 50lb thrust with 5 speed settings i have it cranked to begin and it starts off pretty good speed then 5 minutes later it boggs down lower and eventually after an hr or two, not really usuing it to much it just is pretty much dead, the old TM did the same, is this a battery problem? or do i need an onboard battery charger, any suggestions would be helpful.. thanks.