A multimeter cannot measure battery capacity. Battery capacity refers to the total amount of electricity released once the battery is fully charged and discharged until it stops discharging. In other words, capacity Q = product of current I and discharge time t. There are special instruments for measuring other battery parameters, such as battery testers.
A multimeter is a magnetoelectric instrument with a rectifier that can measure various electrical parameters such as alternating and direct current, voltage and resistance. For each electrical quantity, there are generally several ranges.
Also known as a multimeter or simply multimeter. The multimeter is composed of a magnetoelectric ammeter (meter head), a measuring circuit and a selector. By changing the selection switch, various electrical parameters can bet be measured easily.
Detailed information:
1. Before using the multimeter, you must first perform "mechanical zero adjustment", that is, when no power is measured, the multimeter pointer points to the position. zero voltage or zero current.
2. When using the multimeter, do not touch the metal part of the test lead with your hands. This can guarantee measurement accuracy on the one hand and personal safety on the other hand.
3. When you measure a certain amount of electricity, you cannot change speed during measurement, especially when measuring high voltage or large current, you need to pay more attention. Otherwise, the multimeter will be damaged. If you need to change gears, you must first disconnect the test leads and thenmeasure after changing gear.
4. When using the multimeter, it should be placed horizontally to avoid errors. At the same time, care should also be taken to avoid the influence of external magnetic fields on the multimeter.
5. After using the multimeter, the transfer switch should be set to the maximum AC voltage range. If it is not used for a long time, the battery inside the multimeter should also be removed to prevent it from corroding other components of the multimeter.
Reference documents:
The activation method for lithium batteries that have been left unused for too long is as follows:
1 Prepare the 18650 lithium battery to activate and a normal one. Lithium battery, voltage requirements above 4.0 V.
2. Prepare a section of wire. Peel off a small section of the outer skin on both ends of the wire to expose the copper wire inside, which can directly conduct electricity.
3. Connect the above two batteries (one is a normally charged battery and the other is a non-rechargeable battery) in parallel with wires - connect them in parallel for about 4 or 5 seconds. Determined according to the actual situation. Then separate and measure the voltage of the battery that could not be charged before. It will usually be above 3.0 volts.
At this time, the unused non-rechargeable lithium battery can be charged. Notice,You may see small sparks when two lithium batteries are connected in parallel. Sometimes the battery temperature rises, but it is not hot. It's normal.
If you try the above method several times and the old lithium batteryum still has no tension, you can give up.
Note:
Self-discharge of lithium batteries will cause serious power loss, and low voltage at this time will cause excessive charging current, which can easily cause explosion .
Nowadays, many chargers have a charge protection function, which will automatically detect the battery voltage and automatically stop charging when the voltage is too low to avoid explosion.
In addition, it can also be activated with a special charger. Most lithium batteries can be activated with a universal charger.
Before activating, first use a multimeter to measure the battery voltage, then charge it with an adjustable DC power supply slightly higher than the battery voltage (0.5V-1 V). When the battery voltage increases enough, you can use the charger When chargingement, just use the charger to charge.