i bought this for my husbands work lunch box just in case his phone dies. a few days ago it charged up his phone and also charged up a camera i had troubles charging. i do love New Trent this is my 3rd charger from them and i still carry the first one in my purse. the second one is for my iPad. this product holds it's charge so when you need it, it's still there and really isn't that what an external charger is supposed to do?