This app "Easy Overcharge Alert" is an app that prevents overcharging by notifying you with an alert when the set battery charge is reached.
As a characteristic of lithium-ion batteries, keeping the charge amount close to full charge (90% or more seems to be a guide) puts the most load on the battery. It's a smartphone I bought so much, so I want to use it for a long time if possible. In addition, you can also check the battery status. For your information.