What happens if Apple's battery health is below 80%?

Will affect the life of the battery. After using the mobile phone, the battery life will be shortened and the maximum capacity will be reduced. When the maximum capacity of the battery drops to 80%, the battery life will also drop to 80% of the longest time. Under normal circumstances, the mobile phone can watch video for 19 hours, but after it drops to 80%, it can only watch 15 hours at most. Keep the battery dry, because rain, moisture and various liquids or moisture may contain minerals, which will corrode electronic components and circuits. Don't put it in high temperature. High temperature will shorten the life of electronic equipment, damage batteries and make some plastics age. Don't throw or beat the battery. Rough use may damage the internal circuit board and precision machinery. Because there are chemicals in the battery, please don't disassemble the battery without permission.