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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