MH>TW> All of them I know about use sealed Lead Acid Batteries.   
   MH>TW> They are "Float" type Batteries and they do not tolerate deep   
   MH>TW> discharges very well so if you run them all the way down too many times   
   MH>TW> they need to be replaced.   
      
   MH>True.  I have an extra UPS that I'm not using at the moment, but I leave it   
   MH>plugged in and charged all the time.   
      
   MH>If you leave them off for long periods of time, they will end up not working   
   MH>anymore.  We have had "spare" UPS batteries sitting in our computer room at   
   MH>work sometimes for up to 2 years.  When you go to use them, they almost neve   
   MH>work after sitting that long with no charge.   
      
   MH>- Mark   
      
   That reminds me of whan i worked in hte engineering Department of the   
   Local VA Medical center. We topped off any spare batteries on the   
   charger every three months. And any Batteries in use in Critical Patient   
   care devices was Test Discharged and Recharged every three months   
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