Had some sad times with the nexus 6, battery started bloating up so much it popped the screen off the front and back of the case off the back.
Google is shipping a new one under warranty, but not too thrilled at the instructions to "just wrap it in plastic" and ship it back in the same box. Several attempts to convince the tech support people this maybe wasn't the best idea fell flat, so I guess I'll just order one of these off Amazon (http://www.amazon.com/Teenitor-Fireproof-Explosionproof-Battery-Storage/dp/B00Z8WG11W/
) and ship it in that. Google tech support is convinced it's a "dry cell device" and so long as the battery "isn't leaking fluid" it's fine.... Sigh.
(And yeah, I know the ground-shipping only restrictions on lithium in the US and all that, I'm more concerned about the already damaged device.)