Battery Dimensions:
Length: 35.4mm
Diameter: 18.3mm
Maximum continuous discharge: 10.5amp
Actual capacity at 1amp continuous discharge: 894mAh
This battery is an unprotected it is up to the user to make sure this battery isnt over discharged.
Below are the test results of the battery at 1amp, this battery reached 894mAh which is a lot higher than stated capacity.
Below is the battery tested at 2.5amp, it reached 855mAh which is still substantially higher than stated capacity. Voltage outputs were higher than its competitors in this class too, apart from the impressive TrustFire battery.
Below is the test results at 5amp continuous discharge. The battery reached 747mAh which is still slightly higher than stated capacity. It performed ok at this discharge current but I was hoping and expecting to see results that looked more like the TrustFire battery.

Finally the test results of this battery at 8amps. This is where the battery falls short of what is expected. The battery reached 506mAh, substantially less than stated capacity and a long way off what a 10.5amp battery should perform like at this discharge current.
In conclusion, I would rate this battery as average. The battery has very large capacity and handles current up to 5amp very well, but this battery is supposed to be a high drain version of the red Efest 800mAh battery, apart from a slight improvement on that battery I can not see any evidence of this being exceptionally high drain.
This battery would suit anyone wanting a very high capacity 18350 battery, it will suit the average ecig user well because of its good performance up to 5amp, anyone looking for any higher drain 18350 battery would be better off looking for other solutions.