Here’s a backup battery for iPhone called, “Mophie Juice Pack”. It can power your battery-dead iPhone to last all day or get you through the weekend!
I purchased mine because the cigarette light charger in my car broke and I needed a way to avoid running out of battery ever again!
How it works? You simply attach the juice pack to your iPhone. On the other hand if you want to charge the Mophie Juice Pack simply attach the mini USB connector that came with it and connect it to either a laptop or an iPhone charger. With this, you can remotely charge the iPhone anytime, anywhere!
It works as advertised. I wish I had this long time ago and it would have saved me many times from difficult no-phone situations!