Ji Pi
I agree, as far as I know when your battery hits 20% you should charge it. Avoid overcharging, it's not advisable for you to charge your phone till 100% so keet it like 80% or so.

actually, you can really charged your phone to 100% because of it's overcharging protection on our phones. We are sick enough of this overcharging problems and companies such as samsung, huawei, realme including Device Team of Xiaomi confirmed that newer models/phones can be charged to 100% with no problems. So no power voltage will come through your phone when your on 100%. You know how?? When you charge your phone, you noticed that it heats the back of your phone. When it comes to 80%. The heat of your phone will fade or decrease the pwer of voltage coming in to your phone (charging)