I had a MacBook Pro 2014 that I almost always kept charged since it doubled as a desktop. A little over 4 and a half years it lost about 15% battery capacity. I'm wondering if things have changed since then and capacity will be retained at a better rate with the new 2018 MBPs. If not, how often should I disconnect and let the battery discharge to maximize the lifespan of the battery's capacity? I can't seem to find any consensus on this. Some say it's perfectly safe to always keep it plugged, but I read of one account where a MacBook user's battery only lost 4% capacity over 3 years, so keeping it charged did seem to reduce the lifespan of my older MBP in comparison.