Battery tester for cold cranking amperes test

The battery tester has a casing 10 having an input device 11 and two detecting wires 12, a microprocessor 20, a loading unit 21 and a battery power status detecting unit 22. The microprocessor 20 builds a strategic decision process therein to determine a loading time 21 for a battery 30 according to the battery capacity, battery voltage and detection requirements having 1/N CCA and a loading time input from the input device 11. Therefore, the battery tester detects batteries 30 with different capacities and has accurate detecting results.