The activation method for lithium batteries that have been left unused for too long is as follows:
1 Prepare the 18650 lithium battery for activation and one normal. Lithium battery, voltage requirements above 4.0V.
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. Notethat you can 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 battery still has no voltage, 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 actionver, 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-1V). When the battery voltage rises enough, you can use the charger When charging, just use the charger to charge.