I had keyboard issues(repetitive keystroke issue). While I was fiddling with my system report, I noticed my battery health was down to less than 75% even though my computer is a 15" from late 2018 at ~200 cycles. Apple on their website recommends replacing batteries when it reaches 80% health. https://support.apple.com/en-us/HT201585 I reached out to customer support and they offered to replace the keyboard free of cost which comes attached with the battery too. I brought it home and I have used the computer for just over two weeks, 99% of the time plugged in. I used the computer on battery for a maximum of about 1.5 hrs. My total cycle count already says I'm at 4. My battery capacity dropped from >7400 to <7280. The two times I used my computer on battery, the remaining charge drops from 75% to 45% in less than 30 minutes. No resource heavy operations. Just a streaming video. Not sure what is going on. It's just a two weeks old battery.