Generally speaking, the batteries used in automobiles are mainly divided into two types: water-added lead-acid batteries and maintenance-free lead-acid batteries. At present, most models use maintenance-free lead-acid batteries. However, there are also many Japanese cars, including some high-end models, and some use non-maintenance-free lead-acid batteries.

There has always been such a voice in the battery industry: that the quality of life of lead-acid batteries in recent years is not as good as before, especially in winter, it is even less durable. Although many manufacturers say that their batteries can be used for two or three years without any problems, in practice, there are still many users who feel that the batteries need to be replaced in about a year and a half. Is the life of lead-acid batteries really becoming more and more useless? How long is the service life of a normal battery? To answer this question, we must first understand a premise, how to define the service life of lead-acid batteries.