MMM Arcing on Lipo Connection

[Shazammer]

Ok this weekend I got my 2200kv combo all bolted up in my latest project. An E-Revo with Slayer arms, 17mm hubs with 1/8 buggy wheels, and wearing an Associated SC8 body.

On first connecting the battery I get a good pop of an arc coming off the plugs. The esc works great and all but I know it's not supposed to discharge when you plug your batts in. Is it just the way the MMM is? It does seem to be getting less and less the more I've plugged and unplugged it though.

Anyone else have their esc do this?