CFPS & LFPS (OPzS) battery is the flooded battery with tubular plate，is also known as tubular battery, lead acid battery or deep cycle battery. The users need to maintain and keep the enough electrolyte for the battery to discharge. The positive plate is adopted the tubular plate. It can prevent the active materials from falling off. There is the acid-proof bolt. It is of a special shape of funnel having the function of filtering acid smog and retarding flame. It can measure the density and temperature of electrolyte. Its cycle life is the longest in our VRLA battery. The service life can up to 18 years in the 20℃.