I keep reading post about boats having problems with batteries after spending the night on a the hook. Guys won't run bait pumps all night because the batteries will be dead.
6 volt batteries are the answer, switch your house batteries to two 6volts.
My batteries are 2 years old. we run lights,TV, Refregerator, Bait pumps (two)
all night and start the motor in the morning on the same set of battries.
They cost the same around 110.00 each they are about the same size they fit in same battery box they last longer.
Give it a try
Russ