Scientific maintenance can effectively reduce loss and extend the service life of lead-acid batteries in photovoltaic backup systems. Over-charging and over-discharging must be avoided, as they will damage battery plates and accelerate aging. It is necessary to equip a matching PV controller to regulate charge and discharge status accurately. Battery efficiency is greatly affected by temperature; extreme environments such as intense sunlight exposure and low-temperature freezing should be avoided, and well-ventilated and cool places are preferred. No daily water maintenance is required, but regular wiring inspection and dust cleaning are essential. With standardized maintenance, the floating charge life of special PV lead-acid batteries can reach 3-5 years.