Be full, but not for too long!
Today's batteries are lithium batteries. Don't listen to people say that the first charge takes a long time. The new cup can be fully charged for 3-5 hours on a low charge. Don't overdo it. Don't charge it for too long. Charging time is too long, one is that there will be security risks. Second, it will reduce battery life!
Generally full of later can work more than 8 hours, or very convenient!