CKT3554 battery tester adopts large current and strong anti-interference design, which can provide fast, complete and accurate internal resistance and voltage diagnosis for the lead-acid battery of the backup UPS system. There is no need to stop the operation of the device, and the deterioration of the battery can be measured online and quickly diagnosed to improve the test efficiency. The built- in automatic data saving function can conveniently store test data, and the storage data can reach 2400 groups.