This is the one I ordered last week. Working well so far. Fair number of reviews, 4 stars, and has a two year warranty:
https://www.amazon.com/Onite-Replacement-Battery-Google-Nexus/dp/B015SPUBRS
I got this battery a few weeks ago and it's working well so far. Didn't come with a tool kit but I already had a small screwdriver set so it wasn't a problem.
This is the one I bought last week. Working well, so far:
https://www.amazon.com/Onite-Replacement-Battery-Google-Nexus/dp/B015SPUBRS