For the second time this year my 2009 Optimax 225 DFI wouldn't start this morning (29 degrees). Drew the battery way down trying to start it. Pulled the boat out and plugged in the charger......charged it until charger indicated full charge. Backed down the ramp.....and vroom it started right up.  (45-50 degrees). The first time it did it (February) it was about 39 degrees.....Drew battery down trying to start it....drove it home and charged it....vroom It Started Right Up....(45 Degrees).

 

Any Ideas Why This Happens?

Thanksa

Chris

My idea is that you need a new cranking battery.  Optis have to turn over a few times before they will fire.  I had one for 14 years and as long as I kept a minimum of a 1000 CCA battery in it I had no problems.

First guess would be to clean the battery ring connections, make sure you're NOT using a wingnut, and get a bigger battery. OPTI's need a ton of juice to fire. Get yourself a 31AGM /w 1000-1150 CCA. 

Answer 1 & 2 nailed it. You need maximum juice to start an Opti. Your present setup is okay with warmer temps but not delivering peak capacity at cold temps.