Middle size battery is the high capacity type battery whose size is middle. The typical middle series battery is widely used in many industries. The general features of it are that it has stable and high reliability, the construction of middle size battery is sealed and they are environmentally friendly. As one of the best China middle battery manufacturers, we offer multipurpose middle battery with low pressure venting system and low self discharge. The middle series battery we provide also has the maintenance free operation. It can be applied to wide range of common products.