Like other lithium-ion battery devices such as smartphones and electric vehicles, the tablet gradually drains its battery over time when not in use. If left unused for an extended period, the battery will fully deplete, requiring additional time to reach the necessary voltage for powering on. The Xiaomi Pad 7 Pro has a 8850mAh large-capacity battery, and when fully drained, it requires more charging time before it can turn on. If your tablet has been idle for a long time, it is recommended to charge it for at least 20 minutes before use.