I saw this on RCGroups, HK is having a 4 day sale on all Nano Tech Lipos, 30% off. If you still order from HK check it out, the only draw back is they ship Fedx to us. The shipping from China is 20.00 US.
I checked the 4s 2700 mah 65 - 130c, they where on around 30.00 US. These are good batteries for the E F 1 guys, but are a little heavy.
The weight helps up here at Orangeville flying in the wind.
Ken