Not sure what you have there, but it looks like you have the packs wired in parellel.
http://scriptasylum.com/rc_speed/_wiring_bec.html
go here and choose the "2 series" wiring option. it will show you how the 2 packs should be wired to get the series connetion you are looking for.
This page should show you how to wire any way you want it.