Recently, The McNair electrical problem for the temperature of the battery terminals, cold following test this indicator is the detection of valve-regulated battery terminals terminal sealant performance by hot and cold shock. If the valve control battery for outdoor use, temperature difference between summer and winter, will inevitably be subject to thermal shock, especially in the northern region even more. This indicator is to simulate the use of the battery in extreme conditions. High temperature cycling to -15 ℃ -25 ℃, -60 ℃, 12h for a loop, constant voltage charging to 2.25V voltage terminal sealant that can withstand 45 cycles for the qualified. .
   
Specific test operation: the internal battery is not loaded plate, but the battery terminal structure of the normal battery assembly, the thickness of the sealant is 10 ~ 15mm. Inside the battery compartment into the density of 1.300g/cm3 sulfuric acid solution. The liquid electrolyte have not seen the bottom of the lead terminals. Then press the high temperature cycling to -15 ℃ -25 ℃, -60 ℃, 12h for a loop, constant voltage charging to 2.25V voltage terminal sealant that can withstand 45 cycles for the qualified. The terminal upper acid overflow, pH test paper presents the test to terminate in the red.

Obtained after the experiment: the acid of the above points only to climb for the VRLA battery terminals. The sealant of the remaining indicators such as: viscosity, operating time, cure time, tensile strength, shear strength, chemical resistance properties, resistance to air aging properties have a test instance.