The new number one in performance and price!
Turnigy Hard Case Lipoly packs deliver full capacity at the said C rate.
You wont find a better deal in Hard Case Lithium Polymer batteries anywhere!

Hardcase packs are a must for RC Car enthusiasts. The case helps to ensure that the batteries can stand up to the added stress and shock associated with R/C vehicles.

Spec.
Minimum Capacity: 5000mAh
Configuration: 4S1P / 14.8v / 4Cell
Constant Discharge: 20C 
Peak Discharge (20sec): 30C
Max Charge Rate: 5c
Pack Weight: 528g
Pack Size: 139 x 45 x 44mm
Charge Plug: JST-XH 
Discharge plug: 4mm Bullet-connector