Also, any laptop battery may not age fast as much with overcharging as it does with heat itself; a) due to higher workload making CPU to stay at peak all the time b) ambient room temperature itself. I had my MBP 2017's battery puffed to a point that it was pushing itself against logicboard, I had to replace the battery eventually. You can check your battery charge cycles and charge capacity to see how much it has aged over time.