2V400Ah communication system lead acid gel battery with large capacity Material advantages: 1, German origin fumed silica of 15 ... 3, America 4BS seed material, making polar plate longer life with high and even distributed PbO2. 4, Conductive polymeric material. Carbon ... : circle times is 30% more than world standard. 3, large current charge and discharge features 4, operating environment: -40°C ...