Tom,   
      
   TW>All of them I know about use sealed Lead Acid Batteries.   
   TW>They are "Float" type Batteries and they do not tolerate deep   
   TW>discharges very well so if you run them all the way down too many times   
   TW>they need to be replaced.   
      
     If there are storms in my area (it's like an ungrounded Faraday Cage   
   where I'm at), I shut the computers, etc. down...then turn off, and   
   unplug the UPS units. I normally don't work with the UPS's in "battery   
   mode" when the power is off.   
      
   Daryl   
      
   ---   
    þ OLX 1.53 þ Energizer bunny arrested. Charged with battery.   
      
      
      
      
      
      
      
      
      
      
      
      
                                                                                     
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    * Origin: The Thunderbolt BBS (1:19/33)