Hardcase Lithium Polymer pack for high-end performance brushless electric or modified brushed motor cars.
Big capacity and C rate give up to 250A for 20seconds and up to 300A for instant throttle punches.
Hardcase pack ensures the battery wont get damaged from the g-forces and shock associated with R/C vehicles.

40C is the genuine rating of which the battery will hold voltage well above 3.4v
Other vendors claim their packs to be 40C when in fact they are not. Based on other vendors calculations this would be a 50 or even 60C pack.
All TURNIGY packs are resistance matched.

Spec.
Minimum Capacity: 5000mAh
Configuration: 2S2P / 7.4v / 4Cell
Constant Discharge: 40C
Peak Discharge (22sec): 50C
Pack Weight: 339g
Pack Size: 139 x 46 x 26mm
Charge Plug: JST-XH
Discharge plug: 5.5mm Bullet-connector