Hello Yarom,
You can follow the link below to our developer kit instructions page. This gives simple instructions on parallel and series wiring of packs.
[link=http://www.a123racing.com/Instructions/PT400111.pdf]http://www.a123racing.com/Instructions/PT400111.pdf[/link]
Hope this helps,
Power . Safety . Life
Brian
[link=http://www.a123racing.com]
[/link]