[Paddlewise] Electric kayak pump

     Has anyone read the new Sea Kayaker magazine article about using an 
electric pump in a kayak.  As an experiment I purchased the pump and some 
different size batteries.  The pump mentioned from the article (Atwood V450,  
$13.00 at West Marine) weighs only about one or two pounds.  For a tiny 12 
volt motor like this what would the best battery be to use?  The article says 
to use 8 C Nicad batteries, 1.2 volts each, this only adds up to 9.6 volts.  
Would this hurt the motor by using less than twelve volts.  I tried two 6 
volt lantern batteries, the pump was flying.  Then I used a single 9 volt 
battery, this had a bout 3/4 the output and lasted for a 1/2 hour.  I'm going 
to hook up the two 6 volts again two see how long they'll last.  Could some 
one tell me what the real difference are between these batteries.  The 6 
volts are two pound each and I think the 9 volt weighs about one ounce.  I 
filled a bucket with five gallons of water and the tiny little pump emptied 
it in less than one minute!  This could really be worth while in open water.  
But I would still bring a manual pump for backup.  
Jamy
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