These are the Popular Motor Designs..
24volt is really a obsolete design..the 36volt is the better design..
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If your design is running at 24-volt..your stuck w/24-volt..
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You want a 36-volt Motor..and a 36-volt Battery Pack..or..3-12volt Batteries..
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http://cid-734b8f2abb2a1c06.skydrive...se.aspx/Public
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The above LINK..shows a modification/
I have a 24volt system..the Scooter was delivered w/15-AMP Batteries(2)..
The replacement Batteries are now 10-AH..
I made this modification to use 18-ah Batteries../[end]