In a previous post we discussed how to adjust your iPhone to go longer between charges. If your like me and like to watch movies on long plane flights then expect to call, email, and use maps for hours after you land – you may need to be able to carry a bit of extra energy.

Here are four of the many choices you have. These four represent ways to go longer between having to plug into a wall outlet with slightly different philosophies on how to get your there.

First off it two companies that produce hardware that is commonly known as ‘sleds’. These are devices that the iPhone slides inside of. They allow the iPhone to run much longer, neither of which actually charge the iPhone. Think of it as adding an extra battery via a bit of thickness to your phone.