Hi mate,the battery post's are off an x10 i can't find them on team extreme's website,part number X14AX,you will need to use the battery straps as well,part number X14BX.
They have x11 battery posts (C102A@ £8.09 for 2) and battery straps(C102B@£4.09)
As i'm using x10's i don't know if the x11's are the same diameter,but remember to order 2 sets of battery post's as they come in pairs!
Not sure on the battery straps but here's a link (
http://www.teamxtreme.co.uk/store/in...cPath=4)cheers Peter.