PiJuice makes the Raspberry Pi an independent, stand alone platform. By using intelligent power behaviour, the integrated battery will keep itself topped up when plugged in, and supply any extra power needed to the Pi as required.
The real time clock on board will let your Pi know what time it is even with no power input or internet connection. It will also manage soft shut down and a true low power sleep state and intelligent start up from the off state.
You will be able to always keep track of the charge levels with the built in tri-coloured RGB LEDs, and since the PiJuice will use up to just five of your GPIO pins (just power and I2C), the rest are free to diversify your project even more. The stacking header allows you to continue to use your existing HATs and add ons with PiJuice.