These batteries are not 8000mAh, there are only 4000mAh! The label is false! Costumer service is bad too, they keep turning around the point that they sell a false product!
Please, bear in mind that actual capacity of these batteries is 4100-4500 mAh. Yes, the seller says in the detailed description that nominally capacity is less, however when I open an item description page , it says 8000 mAh.