The case is fully charged when it arrives so the minute i got it i charged my phone to 100 ive bought this case about 2 years back for my iphone 6 i have upgraded my phone recently but the case last all day it has a use of two times a day before you have to charge the case again but it is amazing you dont have to worry about accidentally turning it on as easy unless pressure is on it this case is perfect for use and it uses a micro usb to charge but thats better in my opinion