Wise Charging is a feature available on OnePlus devices that optimizes battery life by learning the users charging habits and adjusting the charging speed accordingly. It is designed to defer the battery drain rate optimally without affecting the user experience. The feature can be set to charge the phone only at night, and it learns when the user is going to leave the phone on charge. Some users have reported issues with the feature not working as intended. Overall, Wise Charging is a useful feature for OnePlus users who want to optimize their battery life and slow down battery aging.