I have a MBA 11 Early 2014. Bought in July 2014. The battery had around 380 cycles and was at around 83%. But it used to last 3-5 hours of super light usage and was also overheating. Went to Apple and asked for a fresh battery at my expense. They obliged. The battery life has more than doubled. It is 8-10 hours or super light usage. Mojave in both instances.