Keeping your phone plugged in after it reaches 100% is bad for your battery. You can use Marsh Smart Plug to stop charging your phone at a desired battery percentage. This helps prolong battery life by eliminating mini-cycles during charging.
Obviously, you will have to buy a Marsh Smart Plug for this project. Also, an Smart Life App (Available on Play Store & App Store). In all, your costs will be between ₱569.00 (was ₱679.00).