03 Oct 12 07:25, TOM WALKER wrote to ROY WITT:


 RW> TW>> That is a good price for that size AGM. On the Optima I have
 RW> TW>> always considered them Vastly overpriced. But for high vibration
 RW> TW>> use they cannot be beat.

 RW>> That one makes the same claims as the Optima does in their
 RW>> ads...although I'd worry about running one upside-down in any event.

 TW> If it is a True AGM battery there is NO effect on the battery during
 TW> Inverted operation

 TW> This from the Internet:

 TW> A relatively new type of sealed battery construction that uses
 TW> saturated absorbent glass (boron silicate) mats between the plates
 TW> instead of a gelled or liquid electrolyte. AGMs batteries are more
 TW> expensive than the flooded (liquid) variety but offer a number of
 TW> advantages.

 TW> Since all the electrolyte (acid) in AGM batteries is contained in the
 TW> glass mats, it can't spill, even if the battery is broken. Being thus
 TW> non-hazardous, AGM batteries are cheaper to ship. Additionally, since
 TW> there's no liquid to freeze and expand, they're practically immune
 TW> from freezing damage.

Not much worry about freezing battery liquids here.

 TW> Nearly all AGM batteries are recombinant, which means that the oxygen
 TW> and hydrogen recombine inside the battery. Recombinant batteries use
 TW> gas phase transfer of oxygen to the negative plates to enable
 TW> recombination back into water while charging, thereby preventing the
 TW> loss of water through electrolysis. The recombining is typically more
 TW> than 99% efficient.

That's good to know.

 TW> AGMs have a very low self-discharge - from 1% to 3% per month is
 TW> usual. As a result, they can sit in storage for much longer periods
 TW> without charging than standard batteries.

This will be the test of the Optima now residing in the trunk of my
Malibu.

 TW> That is of course if the battery is disconnected in storage.

It has a master switch that disconnects the positive post from everything
electrical in the car.

                R\%/itt


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