Running two 2S packs as a 4s,did I do this right?

[speedemall]

Okay,I bought two 2s packs and want to run them as a 4s. I will also be using them individually at times to run my slash. I made this at work today......

http://www.hobbycity.com/hobbycity/s...idProduct=2156

I plugged the packs in first and then the esc and there was a very small spark at the connector as the contacts touched,the esc was turned off,is this supposed to happen? I just don't wanna burn this thing up before I even run it I'm afraid to plug it into the esc fully lol