This a 10,00 mAh battery from a Chinese brand “Kamashi”. The battery is dirt cheap however this battery is very unconvinced as it takes forever to charge even with a 2 Amp charger. The battery is also very heavy coming in at just under a pound (344g).
KMASHI 10000mAh External Battery Power Bank, Portable Charger Backup Pack with Powerful Dual USB 3.1A Output and 2A Input For iPhone 6s 6 Plus, iPad and Samsung Galaxy and More