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Older-fashioned batteries may require us to add electrolyte frequently. However, with the advancement of technology, maintenance-free batteries​ have now been used on a large scale. But even so, the battery is still a vulnerable part in the use of the vehicle, and the service life of the maintenance-free battery is generally about 4 years.

The battery memory effect refers to the reversible failure of the battery, that is, the performance that can be restored after the battery fails.

There are many factors that affect battery service life. The most important one is related to the use of the battery. The specific factors are as follows: