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  CHARACTERISTICS OF RECHARGEABLE BATTERIES

                      Recharge  Fast     Self
            Energy    Cycles    Charge   Discharge
            Density   To 80%    Time     Per
            (Wh/Kg)*  Capacity  (hours)  Month

 Nickel
  Cadmium    45-80       1500       1      20%

 Nickel
  Metal
   Hydride  60-120    300-500     2-4      30%

 Lithium
  Ion      110-160    300-500     2-4      10%

 Lithium
  Polymer  100-130    300-500     2-4      10%

 Lead Acid   30-50    200-300     8-16      5%

                      To 50%
                      Capacity

  Reusable
  Alkaline      80         50     2-3      0.3%


  This data are provided courtesy of
  Cadex Electronics Inc. (www.cadex.com).

  * Wh/Kg = watt hours per kilogram