How much should the battery health of red rice mobile phone be changed?

Less than 70%. According to the query of China Science Popularization Network, if the power is below 70%, the battery life will be significantly reduced, and even the frequency of mobile phones will be seriously reduced. Battery health is the theoretical value of the maximum capacity of the battery. The battery will wear out after a period of normal use, and health is the maximum available capacity after deducting the loss value.