A multimeter cannot measure battery capacity, you need to use a special battery measuring instrument. A multimeter can only simply measure the voltage of a battery or simply determine if a 1.5V battery has power and can be used. Its principle is to measure the voltage while adding a certain current to the battery (equivalent to measuring the voltage of the battery while charging, not the no-load voltage). There is special equipment for measuring small batteries. See attached image. The area circled in orange is battery-specific equipment. Not all multimeters have this feature.
If you know the relationship between voltage and power of a certain battery (and the battery needs to transmit a certain current), you can also use a multimeter to measure the voltage value of the battery and estimate the battery powerIt's just ine.xact, please refer only: For example, the relationship between voltage and power of a 3.7V lithium battery is as shown in the table below, other batteries are mentioned separately) < /p>
The best method is discharge testing, you need to use test equipment (you shouldn't have any). However, you can also get a rough measurement with a simple multimeter. First use the multimeter to measure the voltage, then discharge it to the current you are using (eg: 1c) and see how long it lasts. This way you can understand it. Formula: Discharge current is multiplied by discharge time. For example, the discharge current is 2 amps and the discharge time is 2 hours, which is 2A*2=4A. I hope this will help you !