Hercules Battery 12V88AH lead acid battery has experienced a number of significant improvements to enhance the energy density, cycle life, high rate discharge performance. However, the open-type lead-acid battery has two major drawbacks: ① late charge water will decompose hydrogen, oxygen precipitates, need regular addition of acid, water, heavy maintenance work; ② gas overflow when carrying mist corrosion around the device, and pollution of the environment, limiting battery applications. The last two decades, in order to solve the above two problems, the world racing to develop sealed lead-acid batteries, battery sealed hope to achieve, access to clean green energy. . However, the open-type lead-acid battery has two major drawbacks: ① late charge water will decompose hydrogen, oxygen precipitates, need regular addition of acid, water, heavy maintenance work; ② gas overflow when carrying mist corrosion around the device, and pollution of the environment, limiting battery applications. The last two decades, in order to solve the above two problems, the world racing to develop sealed lead-acid batteries, battery sealed hope to achieve, access to clean green energy. Now our postal department has been widely used VRLA lead-acid batteries as the communication power. Because the battery is sealed, unlike the original, so that stationary lead-acid battery electrolyte as transparent and intuitive, and can not directly measure the density of the electrolyte, and thus bring some difficulties to the use of maintenance work. So people hope by detecting the internal resistance of the battery approaches to identify and predict the performance of the battery. Currently imported and domestically produced VRLA conductance tester for on-line measurement of the internal resistance of the battery has been used in a number of sectors. However, the practice can be found using the online testing VRLA lead-acid batteries internal resistance (or conductance) to identify and determine the battery's performance is not satisfactory. This paper based on the analysis of the composition of the battery internal resistance, testing principles and methods, describes the applicable conditions and limitations of this approach. Battery internal resistance of the composition of the macro view, if the open circuit voltage of the battery is V0, when the current I is discharged with its side potential is V, then r = (V0-V) / I is the battery internal resistance. However, this was not a constant internal resistance of the battery, it is not only working with the battery status and environmental conditions change, but also because the test methods and test duration varies. In their essence, was due to the battery internal resistance r includes a complex and is changing ingredients. Theoretical electrochemistry already pointed out, the battery being charged or discharged when the terminal voltage V is composed of the following three components: formula IRΩ called ohmic polarization, which is caused by the ohmic resistance of the components inside the battery RΩ; is changes in the concentration part in the reaction or generated by the electrode in the vicinity of the liquid layer due to ions, called the concentration polarization; the reaction is carried out by electrochemical reaction caused by the particles, called activation polarization. By (1) shows that the macroscopic measured battery internal resistance (ie, steady-state resistance) R is composed of three parts: the ohmic resistance RΩ, concentration polarization resistance Rc and activation polarization resistance Re. Ohmic resistance, including resistance of the electrode RΩ, separator, electrolyte, connecting bars and poles, and all other components inside the battery. Although during the entire life of the battery due to its grid corrosion and deformation of the electrodes is changed, but the internal resistance of the battery during each test can be considered constant. Since the concentration polarization resistance is caused by the reactive ion concentration changes, as long as electrochemical reaction is conducted, the concentration of ions in the reaction is always in changing, so its value is in a state of change, or measurement of different measurement methods different duration, the measured result which will be different. Activation polarization resistance is determined by the nature of the electrochemical reaction system decisions; battery system and structure determination, and the activation polarization resistance is therefore fixed; only late in the life of the battery or the discharge electrode structure and late status has changed and When the current density change caused by the reaction have changed, but its value is still very small. Our management philosophy: human, institutional, scientific and internationalization of our business philosophy: to advanced technology and services to customers - creating value, creating a win-win our service philosophy: to all customers is fundamental to our growth style: passion, unity, integrity, win-win, dedication, responsibility to our market outlook: the customer's suggestions and comments as a subject of study and research. Beijing Xinyuan Hongyu Technology Co., Ltd. Our company welcome your call! 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