On Thu, 11 Jun 2015 08:31:19 -0400, "Tom" wrote:

So the chap at the C.T. store tells me this new battery will last decades
and wont de-sulfate (which is the reason most deep cycle batteries die).
http://www.canadiantire.ca/en/pdp/gr...l#.VXl-mlJ_9Cg

I think you mean "won't sulfate".

Hint. Find out how much the battery weighs. Presumably both the old
and this battery are both the same size. If you find that one is
substantially lighter, you're getting ripped off for that much in
lead. In general, the more lead, the better the battery.

With all due respect, I don't think you read or understood much of
what people have advised you to do. You also failed to disclose how
you are using this battery, which prevents selecting an appropriate
battery. I think you should reconsider your purchase of what looks
like a marine/RV engine starting motor and possibly ask your well
informed salesman how a magic sock is suppose to prevent battery
damage. I'll try again, although it's probably futile.

Sulfation is a normal part of the charge/discharge cycle of a battery.
When a battery is discharged, it produces lead sulfate on the plates:
http://www.progressivedyn.com/battery_basics.html
"This chemical reaction also begins to coat both positive
and negative plates with a substance called lead sulfate
also known as sulfation (shown as a yellow build-up on plates).
This build-up of lead sulfate is normal during a discharge cycle.
As the battery continues to discharge, lead sulfate coats more
and more of the plates and battery voltage begins to decrease
from fully charged state of 12.6-volts..."
Got it? Lead sulfate production is a normal part of battery
operation.

Where you get into trouble is when the lead sulfate crystalizes.
Amorphous lead sulfate is rather soft and is easily dissolved back
into solution during recharge. Crystaline lead sulfate is more like a
rock and just sits there. As more and more of the plates are coated
with the crystaline form of lead sulfate, less and less lead plate
surface area is exposed, causing a reduction in battery capacity. In
other words, you're not trying to prevent suflation. You're trying to
prevent lead sulfate crystalization. I would be interested in how a
sock can do that.

In my never humble opinion, the best way to prevent crystalization is
to not leave the battery in a discharged condition for very long. Deep
discharge is also a problem.
http://batteryuniversity.com/learn/article/sulfation_and_how_to_prevent_it


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558