1. If the phone battery has been charged, there is also a solution. It is to find the gap of the battery with your finger, poke a small hole with the finger, and let the air inside run out.
2. Buy a new lithium-ion battery pack and replace it with a new battery.
3. Put the lithium-ion battery pack into a low-temperature environment, the microstructure of the lithium film and electrolyte on the surface of the lithium-ion battery, as well as their interface will change significantly, resulting in temporary inactivity inside the battery and reduced leakage current. So after recharging, the waiting time of the phone will increase.