Dropped a glass of water on my Nexus and fried the battery. Needed to replace it using the iFixit tools. The battery was purchased on ebay from a random seller
Repair was easy. start from the USB connector, thats the easiest place to get the tool in to start
There are a collection of gold contacts that are supposed to touch the outer case. I had to bend them a bit outward to ensure a good connection. The first time i reassembled the device did not turn on because not all the contacts were touching properly.