Find a large capacity lithium battery of the same type, or a 3-3.5V power supply that outputs 5A current (such as two strings of nickel metal hydride batteries or a lithium iron battery ), and directly connect the positive and negative poles in parallel with the 18650 lithium battery for one second, disconnect for one second, then reconnect, operate like this for one minute, use the multimeter to measure the voltage, lithium battery has a voltage, connect the batteries in parallel, wait for 10 minutes, remove the battery, use the multimeter to test the voltage value of the 18650 lithium battery, leave it for ten minutes. If the battery voltage drops very little, recharge it. If the battery voltage drops quickly, throw it in the trash. .
Once the lithium battery reaches 0 voltage, the shorter the time (within 1 week), the betterit can be loaded. If the lithium battery reaches 0 voltage for too long, the capacity and internal resistance will be. seriously damaged and the leak will be significant.
How to activate the battery if it cannot be charged?
If the battery cannot be charged, we can try the following methods to activate it:< /p>
p>1. Set the multimeter to DC voltage. At the same time, connect the black and red test leads to both ends of the battery interface to measure the voltage. ?
2. Under normal circumstances, the cell phone battery should have a voltage of around 3.5V when the battery is at its lowest. If the voltage is 0V, or even close to OV, it means the voltage is 0V. The battery has been locked without being charged for a long time, so it cannot be charged when charging directly with the data cable. You must force the power supply to thebattery and activate the battery before it can be charged normally.
3. After correctly distinguishing the positive and negative poles of the battery, set the voltage of the adjustable wattmeter to 4.2V and the current to about 1A, and connect the power cable to charge the battery. .