Use a low-voltage charger to charge for 30 minutes to activate the battery, which can be charged using a computer USB, and a power bank. Use the original charging cable to connect to the power supply to charge, do not use the phone during the charging process. Standby charging can be done, please unplug the power immediately. Go to after-sales repair station. 12 hours of continuous charging. Charge with higher than normal voltage to wake up. Battery hibernation, for the long-term use of lithium batteries for various reasons, due to the reason of self-discharge, the voltage will gradually decline, when the voltage is lower than the minimum threshold voltage set by the lithium protection board (generally lithium in 2.5V~3.0V), it will automatically cut off the power output.
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.