Powering a Raspberry Pi from a LiPo battery isn’t a piece of cake. Fortunately, a couple of expert hackers have done the work for you by writing up the methods.
Building on Daniel Bull’s work to power a Raspberry Pi from a LiPo, Rob Jones has added an analog to digital converter chip to measure voltages and LED indicator lights. This means that you can not only build the power circuitry, you also have some health check indicators to go on.
Sorry, that English was a bit clumsy!
Anyway, if you want to check out Rob Jones’ new tutorial, it’s over on GitHub.