Lead-acid battery capable of prolonging service life

The invention relates to the technical field of lead-acid batteries, and more specifically discloses a lead-acid battery capable of prolonging life, the lead-acid battery comprises a battery bottom shell, the battery bottom shell comprises a battery shell main body, the top of the battery shell main body is provided with two unit placing cavities, and the top of the outer side of each unit placing cavity is provided with a connecting frame fixing groove; by arranging the unit switching device, the total charging and discharging frequency of the battery can be reduced by utilizing the conversion of the battery reaction unit, the condition that the service life of the lead-acid battery is shortened after long-time use is avoided, particularly in short-distance use, the other unit of the battery is kept in a full-charge state for a long time through modularization, the charging frequency is reduced, and the service life of the lead-acid battery is prolonged. And meanwhile, due to the fact that one unit is used f