Love it! So get the battery to charge your phone please hold down the power button on the battery for a solid 3 seconds and than you will see your Iphone charging! I am an artist activist out on the streets NYC and this is backpack super handy. I sweat my guts out so I have to wash the backpack straps -- they smell bad from me -- giggle groan! Backpack nice design and comfy. I am a nerd so I wish the backpack has compartments for pens! The iphone charger parts come from Apple not supplied!