I bought a ANKER 8400 amp. External Battery charger on
Amazon. I bought the smaller one first and it would charge my iPhone 5 2 1/2 to 3 times before I had to recharge. I paid 29.00 for it. Then with that they sent me a discount for the 8400 for 32.00 so I bought it, it charges my iPhone 5 about six times. They are fast and you can charge ur phone any where or anytime at about the same price as a car charger. Plus my large one will even charge my iPad 2. It has a 1amp USB an a 2 amp USB. You use the 1 amp for ur phone the 2 amp for tablets. It even has a led flash light built in too. I really like it because I've been at a hospital and had to leave the waiting room to go out to my car to charge my phone this way I don't. It is total freedom from ur car to ur pocket. I like this way better and like I said they are about the same price as a car charger.