GTrusted

One neat thing about the USB Type-C is that many devices with USB Type-C potentially become instant emergency battery packs when your phone or tablet runs out of juice.

To try this out, I used the LG Google Nexus 5X to act as a battery pack for the Google Pixel C tablet.  

First, I made sure the battery on the Nexus 5X was charged fully and the Pixel C battery was fully depleted.

 

After connecting the Nexus 5X to the Pixel C directly using the Nexus 5X's USB Type-C to USB Type-C cable, the Nexus 5X will show the USB for charging notification.  In this initial state, the Nexus 5X is being charged by the Pixel C.  

Once you select Use USB for Power supply on the Nexus 5X, the Nexus 5X will stop being charged by the Pixel C and instead provide power to the Pixel C.

 

From the Nexus 5X's Battery screen in Settings, the battery becomes depleted, taking less than 2 hours to completely charge the Pixel C.

  

 

On the Pixel C, the Android notification will show USB for charging.  After almost 2 hours, the battery on the Pixel C only got charged to about 16% which isn't a lot but good enough for emergency situations.

Note that when I connected the Pixel C to the Nexus 5X, the Pixel C would half the time only show Power supply rather than the full range of connectivity options.  This seemed to just randomly happening for some odd reason.  In this case, the Pixel C can only provide power to the Nexus 5X.