I have bought this Racing Pack, as the price for a capacity of 5,000 mAh is quite favorable. Unfortunately, the statement holds the capacity in a practical test is not what it promises. In direct comparison with a Racing Pack, it can max. keep up with a 3,000 to 4,000 mAh Racing Pack. Since it is therefore not cost-effective or more expensive than other vendors, there are still 3 stars. Nevertheless a certain disappointment.