Jack Erbes wrote in news:47dedd5e$0$12570
:

Do you really thing that pulling a battery down to 11.9 Volts means it
is permanently sulfated?



Not if it's recharged within a day or two. But, left for weeks while some
boatyard screws around letting it lay there in a discharged state like this
with a NO LOAD voltage of 11.8VDC, yeah, it's gonna be hurt. The longer it
goes on, the more it gets toasted.

I don't want to depend on a yard-toasted starting battery, do you?
Starting the diesel in a timely manner with great reserve, just in case it
needs priming or more than a touch, is a very important task....as the wind
and current push it into that $1.2M superyacht owned by the law firm of
Diaphram, Foam and Condom, LLC, who haven't lost a case since 1962.

Yeech...no thanks!

As you cannot tell the REAL condition of an AGM battery, even the day you
bought it, the chance to hear that groan from the starting motor just isn't
worth it....followed by an eerie silence when it should be making a loud
knocking noise causing billows of white smoke from cold cylinder wall
condensations.

That battery's fine if he can cross-connect the house batteries to crank
it. But, most boats aren't setup with jumper cable switch banks, like
ours, that can make the starter cables JUMP if the beast kicks back...(c;