Hi, I recently got a secondhand MacBook 2016. It had a cycle count of 19 and I have been using it for almost two weeks now so the cycle count is now 21. Is it okay to keep my laptop charging whilst I'm using it because I'm scared for the cycle count to go up? Is it also normal if the battery decreases fast, probably 1% every 3 minutes? I'm getting quite worried since I only use it to watch Netflix and nothing else. should I have it checked? The full charge capacity keeps fluctuating also, from 5320-5430. Is that still normal? Thanks!