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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