This battery is amazing.  My daughter charges it and keeps it in her purse so if she's out and her battery on her phone is low, she can plug this in and recharge it.  Her friends will even come to her for its use so their phones don't die before they get home.  Well worth its price and it'll completelly recharge your iphone in about 20min to a half hour.  And the best part is an outlet isn't needed!!!!