looks like I have same problem with my MacBook Pro 15 mid2014. bought on eBay one month ago with 4 cycle count battery, now has 40 after one month usage and battery health dropped from 9000 mah to 8300. i’m using 100% original MagSafe 2 charger directly from apple.com so maybe seller sold me refurbished MacBook with bad battery quality. I’m losing 200mah every week with only browsing use ?