We have introduce many nice power banks, but if you want a more versatile option, the following Jumpr portable jump starter and backup battery should be more suitable for you.
The Jumpr is a multi purposed power bank that measures 5.5 x 3 x 6 inches and weights only 7 ounces. As shown in the images, the multifunctional power bank features an ultra portable design for easy to carry and comes with a large-capacity 6000mAh backup battery in order to offer a on-the-way to charge your smartphone, tablet and other mobile devices via its 5V 2.1A USB output, while a 12V 150-300A output makes the backup battery serve as a jump starter to reactivate your car on the road in minutes. Apart from that, the power bank also has an in-built LED flashlight in case you need to work in the dark.
The Jumpr jump starter and backup battery is priced at $69.99 USD. If you need it, jump over to Juno Power official site for more details or take a look at the demo video first.