Smartphone with two batteries appeared! You forget to recharge

While large manufacturers are trying to optimize battery life, those from Gionee chose another approach.
The new M5 Gioness passed by Tena in China, being a smartphone with 2 batteries of 3,000 mAh each, with a total capacity of 6,000 mAh. Although there is too much information, it seems that the phone can withstand four days on a single charge!

What's more impressive is that the phone can work in a way that only one of the two batteries is functional and can upload them alternately.