Recently, we have seen a new smartphone Oukitel really cool because it has an internal battery of 10,000 mAh. Now, it turns out that the company has released a new series of smartphones called Black Bull and equipped with large batteries.  According to the details emerged, the new range of devices Oukitel consists of several products. In addition to the large batteries, the company also announced some interesting features that we will find within these devices. For example, the Black Bull range will feature a power saving mode which will enable your smartphone to ensure 60 hours of