Battery sizes

[jodysranger]

can anyone advise me on the pr

can anyone advise me on the proper size battery for a 77 115 merc o/b?

 

[scallywag]

just cranking or are you runn

just cranking or are you running lights? tunes ?fish finder? trolling motor? Charging system capability? I have both a 850 mca and a 650 mca but that is because i run a lot of accesories for sometimes 8 or more hours when using my non charging kicker.
The 650mca is more than enough for cranking my 96/60. Bigger better but cost and weight is up to you.