Strictly speaking, the multimeter can only measure current, voltage and resistance, not capacity. But you can use the multimeter to roughly measure whether the lithium battery has insufficient capacity, that is, use the DC current gear of the multimeter (preferably a pointer meter). Instantly measure the positive and negative polarity of the battery. If the current shown on the meter is very high, it means the battery has capacity. If the current shown is very low, the battery has insufficient capacity, but this method is a destructive measurement. In effect, it is the same as short-circuiting the battery to take a look at it. Therefore the measurement should be contacted at all times. Never for a long time. Otherwise even a good battery. Also put the electricity discharge.
Equipment: multimeter, small light bulb or high-power resistor, timer or mobile phone.
After the battery is full, leave it empty for 2 hours, measure the no-load voltage and record it. Connect a small light bulb or resistor, measure the current, the current is best controlled in the capacity of 1/10 or so, every 1 hour to measure the current, you can also measure the voltage and then converted to current, when it is almost to 3.2V, every 10 minutes to measure the current and voltage. Stop measuring until the voltage drops to the protection voltage to prevent damage to the battery from over-discharge.
But there are some friends will use a multimeter to test the size of the battery short-circuit current to judge the battery capacity, with this method to the same specifications of the battery pack matching, the effect is OK, but some batteries open circuit voltage is normal, once the short-circuit current measurement, it will be the original form.
Measurement of short-circuit current (if the current value in the multimeter allows and the battery allows the range), but also can only compare the size of the same type of battery power. Different models can not be compared, because the standard internal resistance of different models of batteries is not the same, even if the memory of the same amount of power, its short-circuit current is not the same.
