All good except a very poor battery. VERY VERY POO...

All good except a very poor battery. VERY VERY POOR.
I got an iPhone 5c for a friend whose really not confident ordering online. It arrived after approx 3-4 days in good looking condition and I only mark 3 star as all is well thus far but I will say A big negative is that the battery runs down on it really fast, like within 20 to 30 mins use and that's Bluetooth & wifi off. I'm unsure if I'm up for returning based on others comments of UK Mail. My friends not said much more to me I hope he's still talking to me. .