Okay, here's what just happened to me:
I went to sleep in the night with my phone's battery at around 29%. I just woke up and my phone's home button wouldn't respond. Then, the power button wouldn't respond! I took the battery out and put it back in. It still wouldn't respond! So, I plugged the charger in and then it showed me that it had begun charging. I turned the phone on and as soon as it reached the lock screen, it turned itself off. It did that twice more so I decided to let it rest. Now, it turns on. (>_>)
Apparently, 29% of its battery was somehow consumed last night. I really don't know how!!!! My wifi was on,it seems, but around 30% battery drain in just a few hours?!! That's insane! I'm on stock DL4. Not even rooted!
So it's not a "death" case, per se, but I had a really bad scare.
Android devices owned: Samsung Galaxy S GT-I9000, 8GB, Samsung Galaxy S3 GT-I9300, 16GB (Pebble Blue), Nexus 7 (2013), 32GB