Battery lifetime and lifetime of other components?

Also, if you think the documentation could do with clearing up in places, there's a little arrow (⇒) to the right of the function name, and it brings you to where the function (and documentation is defined).

I'm insanely busy at the moment, so if anyone does have time to issue pull requests to clear things up or add examples, it'd really be appreciated. I'm working on the code now, so I'll add NRF.sleep though