The used of the battery when there is light energy emitted by the solar panels to save up to when needed and then released. Solar batteries are 'battery' application of solar photovoltaic power generation, currently used lead-acid maintenance-free battery, ordinary lead-acid batteries, gel batteries and nickel-cadmium alkaline batteries four. China is currently widely used solar batteries are mainly: maintenance-free lead-acid batteries and gel batteries, these two types of batteries, because of its inherent "free" maintenance features and characteristics of the environment cleaner, it is suitable for reliable performance solar power system, especially unattended workstations.