http://www.instructables.com/id/How-to-rebuild-a-Dewalt-144v-battery-pack/

https://www.google.com.pk/search?q=DEWALT+batteries+diagrams&es_sm=93&biw=1024&bih=667&tbm=isch&tbo=u&source=univ&sa=X&ei=Bnm9VIbPBczOaMa9gKAB&ved=0CBwQsAQ

36v
http://www.rcgroups.com/forums/showthread.php?t=587606

18v

Diagrams of connections 

http://luno2012.hubpages.com/hub/replacebatterycells
http://luno2012.hubpages.com/hub/replacebatterycells#slide7815453