Yeah I opened a ticket a month before my warranty was up. My battery meter kept going to just a ? and not doing anything. After a while of fucking around with settings, and going back and forth between beta and release versions of android (which google said it was my own problem for being on their beta in the first place), I just got tired of it.
I was able to factory reset it and get it to stay on a battery percentage for long enough at the store to trade it in and I was do0ne. After I traded it, Google finally emailed me back saying it was a known battery issue but since I was out of warranty it would cost me a $250 charge to fix. A slap in the face.