late-2013 rMBP 13" user here... At work yesterday around 5PM my battery was at 100% while on the charger. I slept my laptop, went home, didn't use it until this morning. When I took it out of the bag it was slightly warm and upon opening it, battery was down to 60%. This has never happened before; I upgraded to 10.9.2 yesterday. Anyone seen this behavior? This is especially annoying as I was so proud of the late-2013 rMBP's low battery usage during sleep! It's my favorite feature.