I think after the Note 7 debacle Samsung put extra attention into its batteries and battery management, so that's probably the last thing you have to worry about.
I bought my S9 used on Swappa over 5 years ago. I usually keep the battery close to full, on wireless at home or work and plugged in while driving. Still doing fine.
I bought my S9 used on Swappa over 5 years ago. I usually keep the battery close to full, on wireless at home or work and plugged in while driving. Still doing fine.