Hi All A warning and hopefully some help. Since I updated my MID 2014 MBP retina from Mavericks to Sierra My battery drains about 3 times faster than before. Without having some concrete numbers, since the update last week the laptop shut down twice already because of no battery, and nearly every day I get at least one "low power" warning! In the 19 month I have the Macbook now this happened before that ones! My worry is that Sierra will fry the battery the same than one update did a couple of years ago on my MBA. Apple admitted a software problem at the time, but never compensated for the damage! Any advise except to revert back to mavericks?? I have no idea why this is a wiki post!