technical details:Voltage 12vcapacity33AHour rate20Dimension (mm)195*132*168*168weight9.9kg+ - Polarity The system is equipped with digital screen, charging port, USB port, DC5521 port, home power system Digital display with real-time view voltage, system power, system use of days, etc1. used for various home appliances and office also2.two option for charging available3.build electronic chip-it can real time monitor voltage ,power and temperature 4.controlling input and output current protect battery from overcharging and overcharging and extending service lifeSafety Precautions1. Do not dismantle for repair or modify, or the system of sulfuric acid, lead will cause harm to people and the environment.2. Do not shorten the positive and negative terminals of the system or system group,otherwise it will cause electric shock, fire or malfunction.3. Please firmly connected to the terminal part of the bolt, if loose will become the cause of the fire.4. Do not c..