As most of you know since most of the entire world by now owns an iPhone, it has a built-in battery. Which is fine, but when your iPhone runs out of juice, it can really suck. With other phones you can have a second battery handy as a back up.

Well, here’s the iPhoneck Backup Battery for the iPhone. It can charge up to 60% of your iPhone’s battery life when you let them mate. It’s design tries not to interrupt your iPhone’s design too much, by basically adding a bit of a neck to your phone. It’s available for $35.21 and is sure to come in handy, while making you look like you have the longest iPhone ever.

[IPmart]