What does the end of battery life look like?

The battery usage time far exceeds the normal usage time. The battery can be used normally for more than 1 year. The user should determine whether it is scrapped according to the specific conditions and operating conditions. Generally, the service life of the battery with a greater depth of discharge is about 1 year, and the battery life with a depth of discharge of 50%-70% is less than About one and a half years. The batteries produced by individual manufacturers can reach more than 2 years.
When the following phenomena occur, it can also be judged that the battery life has ended.
(1) The actual discharge capacity of the battery is less than about 60% of the rated capacity, and if it cannot be increased significantly after maintenance, it can be determined to be scrapped. This is due to the fact that the performance of the battery will be greatly attenuated after the capacity decays to about 60% during the use of the battery, and all components have basically reached a deteriorating state. This attenuation has a tendency to gradually accelerate, and it will soon completely lose its charge and discharge capacity.
(2) When the battery is charging, it generates severe heat. When the battery reaches the end of its life, the positive electrode will be severely softened (the main failure mode), the active material will fall off, the internal resistance will increase, and the impurity elements in the electrode will continue to dissolve out, which will increase the gas evolution rate during charging, poor efficiency and heat generation increase. At this time, if you open the battery safety valve to check, you will see that the electrolyte is "black", and it cannot be repaired if it is severely failed. At this time, the battery self-discharges quickly, and sometimes it runs out soon after charging.
(3) The end-of-life storage battery has drastically reduced performance and extremely unstable performance, which may cause undesirable consequences: such as heating and deformation during charging, short circuit, open circuit, and even explosion hazard. Therefore, when the battery reaches the end of its life, a new battery should be replaced in time.