Can I measure battery level without any external components nrf51

[Mikhail]

I want to undestand this. I can't see any examples with it. In the example ble_app_proximity I always received 100% level. If it possible, can anybody give a ADC config example for it? Thanks.

[endnode]

Read this.

[Mikhail]

I readed all comments, but I can't follow to link above. It doesn't open. Relink pls.