My Atomic 4 draws 120-130 amps to start. I use a U1 size battery for the start 
battery. When the engine is warm it starts in about 1 second maybe. For a cold 
engine on a cold day the battery works but is a bit marginal. If it ever proves 
too weak, and it never has, I can parallel to the house bank.
A U1 is usually around 200 CCA and 31 AH. It would be kinda small if you are 
running glowplugs or electrical preheat before starting.

Joe Della Barba
Coquina

From: CnC-List [mailto:[email protected]] On Behalf Of Dennis C. 
via CnC-List
Sent: Tuesday, December 01, 2015 1:45 PM
To: CnClist
Cc: Dennis C.
Subject: Re: Stus-List small start battery for yanmar 3hmf

Just for info, most 2-3 cylinder marine diesel starters require 150-200 CCA 
(cold cranking amps).  Recommended battery size from many diesel manufacturers 
is 400-600 CCA.
Dennis C.
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