Three ways to test the goodness of a battery with a multimeter
Method one:
Select an appropriate load resistor connected in parallel between the positive and negative terminals of the battery.
Battery voltage and the remaining power there is some kind of known relationship, so according to the capacity and use of the battery, and then measure the voltage at both ends of the resistor, to see this time when the battery voltage with a load compared to the degree of no-load drop, you can judge the battery's power; However, the premise of the article e79fa5e98193e78988e69d8331333365666266 pieces is not to apply any load, the case. When a load is applied, the battery voltage will be distorted by the voltage drop caused by the internal impedance, and will gradually decrease at different rates over time, and will gradually increase after the load is removed. Therefore, if a load is applied, it will affect the results of the dry cell battery charge measurement.
Method two:
Multimeter can also accurately measure the voltage of dry batteries, through the measurement of dry battery voltage level, the power to judge, dry batteries have alkaline batteries and carbon batteries.
If the measured voltage is not less than the marked voltage of the dry cell, it means that the dry cell power is sufficient; less than the marked voltage of the dry cell more, it means that the dry cell loss of power more, due to the different models of dry cell test results will be affected, but for a single dry cell, as long as the use of ordinary pointer multimeter, the multimeter will be selected as the maximum current file (0.5A-1A), the negative pen connected to the battery's negative terminal, the positive pen on the positive terminal of the battery, and the negative pen on the positive terminal of the battery. Positive pen on the positive terminal of the battery quickly touch, pay attention to observe the movement of the needle (short-circuit current) situation, you will know how much power is left in the battery.
Method three:
Two identical batteries at home, measuring the open-circuit voltage are 1.5V, you can measure the internal resistance of the battery to detect the battery's power. First measure the open-circuit voltage of the battery, and then connect a load (such as a small lamp bead) on the battery, the voltage of the battery will drop, and measure the voltage. The difference between the open circuit voltage and the loaded voltage divided by the current of the loaded operation can be roughly calculated the internal resistance of the battery, the larger the internal resistance of the battery the smaller its power.
