If you want a phone charger that you can take anywhere, ChargeCard could be your answer. This simple device fits in the credit card slot of most wallets.
ChargeCard uses the “world’s thinnest USB cable” to provide a charging cable that connects your phone with the power of a USB port. The cable itself is housed in a credit card shaped holder that is the thickness of 2.5 standard credit cards. Plug one end into your phone and then pull the flexible cable out of the holder. Then, you can plug it in to charge.
Of course, the downside is you have to be near a USB capable device. You cannot charge it in the middle of nowhere unless your car happens to be USB-compatible. Nevertheless, this could save you from toting your charging cable to work every day. In the modern world, it’s rare not to be near a USB.