The main body of the battery sleep is the unused lithium battery, which is characterized by a gradual decline in voltage. For lithium batteries that are not used for a long time for various reasons, the voltage will gradually decrease due to self-discharge, and when the voltage is lower than the minimum threshold voltage set by the lithium protection board, the power output will be automatically cut off.
At this time, the voltage can not be measured outside the lithium battery with a multimeter, and it can not be charged with a mobile phone and universal charger, which is called battery dormancy.