Super useful hack from Daniel Bull posted on Google Plus, via raspberrypipod.
Including low battery automatic shutdown (to stop your SD card from getting corrupted), push button start, and automatic power supply off when the Pi is shutdown to stop your LiPo from going flat.
I’ve included full instructions on how to do this including circuit diagrams here:
https://github.com/NeonHorizon/lipopi
Featured Adafruit Products!
PowerBoost 500 Charger – Rechargeable 5V Lipo USB Boost @ 500mA+: PowerBoost 500C is the perfect power supply for your portable project! With a built-in battery charger circuit, you’ll be able to keep your project running even while recharging the battery! This little DC/DC boost converter module can be powered by any 3.7V LiIon/LiPoly battery, and convert the battery output to 5.2V DC for running your 5V projects. (read more)