1)﹑For batteries in normal use, if the standby time is less than one day, you can wrap the mobile phone battery in newspapers and put it in the refrigerator, freeze it at -10℃ for 24 hours after freezing. , remove the battery and leave it for 5 hours. Return the battery to normal temperature then place it on the cell phone charger to fully charge it. (Note: Original batteries are better)
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(2). Repairing cell phone batteries is different from repairing lead acid batteries. The following steps are for your reference:
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1. Solder the protective plate (the soldering iron is grounded); 2. Constant voltage 4.2V, charge with current 10% of capacity; there is no current, increase the voltage to 10 V and wait a second. Then disconnect, continue 10 times, then charge according to the above method 4. Discharge: Dischargergage to 3.2V, then charge using method in 2; ; 5. The electrolyte dries out and cannot be repaired. 6. Do not damage the seal. 7. After repair, weld the protection plate to its original position. 8. Mobile phone batteries are prone to explosion, please pay attention to safety during operation.
Is there a problem with lithium batteries for electric vehicles? How to activate the lithium battery protection board? The electric vehicle battery suddenly failed to charge two days ago
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Lithium iron phosphate Protection panelbattery How to open after closing
When the lithium battery protection board is in the protected state, the most normal way to activate it is to charge it. If it cannot be activated even while charging, there is. no way to activate it by other methods.
Your current state is not a matter of whether charging can be activated, but that your protection board is still in an abnormal state, causing the protection board to work and disconnect the charging and discharging. and discharge have no effect. You can only first remove the cause that makes the protection card work, then reload it to activate it. Some protection cards with self-recovery can activate as long as the abnormal situation is resolved, without charging.
Check the battery circuits carefully. First disconnect the car battery itself (disconnect charging), then use the charger to charge. You can use a multimeter to measure whether there is voltage at the battery output terminal. If so, the voltage output means there is a short in the circuit of the car itself. After connecting to the car, the battery protection board will disconnect and stop working if it detects a peripheral short circuit. If there is no output voltage, there is an abnormality in the battery itself. Check carefully if the connection wires connecting each battery together are shorted or if any of the connectors are loose. Then check whether the protective board itself has fallen onto screws, iron flakes and other conductive materials or whether the protective board itself has been damaged. If you don't see the obvious situation, if the protection board itself is broken, you will not be able to repair it personally. There is no circuit diagram ni of parts, unless you are in this sector.
Last warning, if there is a problem with the battery, it is best to return it to the original factory for repair. Don't make random connections on your own. If the protection card fails, you are obliged to do this. directly connect the output if you accidentally short circuit the battery., will burn and explode, causing serious personal safety hazards.
Cannot be unlocked.
It is not possible to unlock the battery protection board because it is completely locked. Directly charge the positive and negative electrodes of the lithium battery. When the lithium battery voltage reaches the minimum limit voltage of the protection board, the protection board will work. Just charge it and it's activated. The battery itself has a circuit to protect the battery.When the battery is fully charged. If the charger continues to work, there is a certain probability that it will cause overcharging and the battery will be locked out for protection reasons. Can be unlocked by draining excess electricity.