The "nano-tech" batteries are just as hit or miss as any of the hobbyking batteries.
Zippy, turnigy, rhino, nano-tech whatever. Basic rules apply, the biggest mah you can fit and the highest "c" you can afford.
I've got a growing pile of DOA and puffed hobbyking batteries. I'd still rather take my chances than pay for "premium" batteries. My last hobbyking order was over $400