Yes, it needs to be replaced. The service life of lithium batteries commonly used in solar lights is generally 3-5 years, and that of lead-acid batteries is 2-3 years. When it is found that the lighting time of the lamp is significantly shortened (for example, from the original 8 hours to less than 3 hours), and other faults are ruled out after inspection, it may be that the battery is aging, and it is necessary to replace it with a battery of the same model and parameters in time.