1. At the normal temperature of the engine, a voltmeter is attached to the positive and negative of the battery, pulling out the fuel injector wire, so that the engine can not start;
2. Start the engine continuously for 5~10 seconds, and observe the degree of voltmeter;
3. Connected to the starter and the line is good, 12V battery voltage at 9.6V or higher than 9.6V, indicating good technical condition of the battery; if the voltage is lower than the value, it indicates that the battery in the loss of electricity, save electricity shortage.