Is your mobile phone's battery life insufficient? The Baseus High Volume for Apple iPhone 7 Plus, 3400mAh Phone Battery is a spare power supply. It can fit Apple phones, particularly iPhone 7 Plus. The Lithium-ion (Li-ion) Battery has a capacity of 3400 mAh, which guarantees longer run time. To keep this mobile phone battery running at its full capacity, please follow the manual on suitable charging.