Hobbyking now lists nano-tech A-SPEC in 12S and 7S packs:
Turnigy nano-tech A-SPEC 5000mah 12S 65~130C Lipo Pack (AUS Warehouse)
12S 5 Ahr $253.58 after the 6% 'wait-a-minute' discount:
Capacity: 5000mAh
Voltage: 12S1P / 12 Cell / 44.4V
Discharge: 65C Constant / 130C Burst
Weight: 1717g (including wire, plug & case)
Dimensions: 300x52x56mm
Balance Plug: JST-XH
Discharge Plug: 5.5mm Bullet Connector
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=36702
Or, connect two of these 7S packs in series to make a 14S battery, which is the highest voltage supported by high-power commercial RC chargers:
Turnigy nano-tech A-SPEC 5000mah 7S 65~130C Lipo Pack (USA Warehouse)
7S 5Ahr are $156.51 each before the 6% 'wait-a-minute' discount:
Capacity: 5000mAh
Voltage: 7S1P / 7 Cell / 25.9V
Discharge: 65C Constant / 130C Burst
Weight: 978g (including wire, plug & case)
Dimensions: 154x49x63mm
Balance Plug: JST-XH
Discharge Plug: 5.5mm Bullet connector
http://www.hobbyking.com/hobbyking/...0mah_7S_65_130C_Lipo_Pack_USA_Warehouse_.html