Keep in mind that the “normal” or “standard” car jump starters use 12 Ah 
batteries (AGM or even Lithium), and they are big (good) enough to start a car. 
So an 18 Ah battery should be more than adequate to start a small diesel.

Marek

From: Josh Muckley via CnC-List 
Sent: Tuesday, December 01, 2015 10:16 AM
To: C&C List 
Cc: Josh Muckley 
Subject: Re: Stus-List small start battery for yanmar 3hmf

I have purchased a "spare"  3HM35F and it is sitting in my garage.  I have some 
old AGM batteries which used to be rated for 75Ahs.  They currently only test 
at about 6Ahs.  Since they were sitting around waiting for disposal I grabbed 
one and hooked it up.  It started the engine without a problem.  Keeping in 
mind that it isn't a "good" battery, it was only able to crank the engine for a 
total of about 45 seconds.  I think that one of those lithium batteries at 
18Ahs would probably get you a minimum of about 3 minutes of crank time which 
should be more than enough.

I'll tell you what, I'll do the testing if someone else provides the battery.   
;-)

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD 
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