It is no secret that you can try all kinds of fun projects with a Raspberry Pi. The PiJuice Portable Platform lets you have even more fun as it makes your Raspberry Pi an independent platform. It has a 1400 mAh battery and serves as a full UPS solution for your device. There is a full power management API available for it. It also has an integrated real time clock.
With the PiJuice, you can power your Raspberry Pi outdoors. The developers are also working for a solar solution for the Raspberry Pi. You can find this project on Kickstarter.