have a 2007 Mercury Optimax hooked up to an Optima Blue Top Cranking battery. Used the boat all summer and had no issues. Took the boat to school and it sat for about a month. Boat wouldn't trim or start when I took it out. I charged it up a few times and it would run. Every time it would sit for a little while, the battery would not be charged. I took the power poles and disconnected them. That seemed to work ok; however, now the only thing I believe is hooked up to the battery is the motor. It keeps dying on me. Half the time I've wanted to take it out the motor won't start. Engine is in great shape as well.

Take the battery and have it tested.

Just now, jbsoonerfan said:

Take the battery and have it tested.

will Lowes or Walmart do this? Not a lot of other options here at school

 

Wal Mart should be able to test it. 

Just now, jbsoonerfan said:

Wal Mart should be able to test it. 

awesome, thank you

Do you have a main battery shut off or disconnect it when you let it sit?  If not, I'd be looking for a small drain on the battery.  My Bullet had a couple lighted toggles that wouldn't shut off, but that battery had a main shut off switch.

My motor has a constant drain if I don’t use the cut off switch.  

?