Excessive current output or excessive discharge of lithium batteries during use will cause the battery's external circuit to be protected. When I was repairing cell phones ten years ago, cell phone batteries could still be removed and charged. The most common problem I encountered was that the battery was too drained and could not be recharged. There are two solutions. First, use a multimeter to measure if there is voltage on the battery contacts. If so, it means the circuit board is in protection state. Just wake it up with high voltage and it can be charged. The voltage of the mobile phone battery is 3.6 volts and it charges normally. The voltage is 5 volts. The wake-up voltage is usually adjusted to more than ten volts or more than 20 volts. After confirming the positive and negative poles of the battery, tjust touch the high voltage several times. Start with more than ten volts until the battery can. be charged normally.
Second, if there is no voltage on the battery contacts, it means the battery has been left too long and the voltage inside is exhausted. At this time, high voltage cannot be used to wake up. . Use a blade to scrape the wrapping paper at the battery contact base, remove the protective circuit board, and charge the battery directly bypassing the electrical board. This method requires professional technicians to operate. Generally, those who have no experience in electronic maintenance should not try it. After a few minutes of charging, the battery protection board can detect the voltage and it can be charged normally. The protruding part of the battery in the picture below is the circCharging protection uit. The mobile phone protection circuit is located under the contact part.
Disassemble the battery and use a 4.2V charger to charge each section separately. There is no need to fully charge it. Each level has 3 volts and can be charged together. This saves time, but the battery capacity will be significantly reduced.
The phone cannot be charged. Is it because of the battery or the charger?
Lithium batteries have a self-discharge phenomenon. If the battery voltage is stored below 3.6V for a long time and not used for a long time, the battery will overdischarge. and damage the internal structure of the battery, thus reducing its lifespan. Therefore, lithium batteries stored for a long time need to be recharged every 3 to 6 months, that is, they should be charged at a voltageion of 3.8 to 3.9 V (the optimal storage voltage of lithium batteries is approximately 3.85 V) and do not recharge them. be fully charged.
Detailed information:
Lithium-ion batteries must remain above the minimum operating voltage at all times . or The self-discharge reaction will cause the lithium-ion active material to decompose and destroy and may not be able to be reduced.
Any form of overcharging lithium-ion batteries will result in serious damage to battery performance or even an explosion. Lithium-ion batteries should avoid overcharging the battery during the charging process.
Do not frequently discharge or deeply charge. However, every 30 charge cycles, the power sensing chip will automatically deep discharge and recharge.Deep rge to accurately assess battery condition.
Do not charge the lithium battery after it is exhausted.Is the battery affected?
1. There may be a problem with the battery power display caused by a malfunction in the mobile phone system. This type of problem is the easiest to resolve. You can directly shut down and restart. This is equivalent to refreshing the data and the overall power display will be restored.
2. The charger is defective. This type of breakdown is the main reason why cell phones cannot be charged. So how can you judge the quality of the charger? It's very simple, just try another charger. If it can be charged, then you can conclude that the charger is faulty. If you encounter this kind of problem, you have no choice but to buy another charger.
3. There is poor contactbetween the charger and the mobile phone. It is also very common that due to the negligence of cell phone users, the charger is not plugged in properly. The solution is simple, just change the socket back and forth.
4. There is a problem with the mobile phone battery. Generally speaking, it is rare for cell phone batteries to experience problems. But whenever there is a problem, it's a big problem that needs to be taken seriously. When it turns out that the charger and the mobile phone system are not faulty, you should focus on checking the battery. If you find that the battery is swollen, it means that there is a problem with the battery and you should stop using it immediately. Do not take any risk.
5. The mobile phone itself has quality problems. If you buy a copied phone, there is a high probability thatthe phone is malfunctioning. If it is a brand machine, it must be sent back to the original factory for processing.
How to solve the problem of 18650 lithium battery not charging
Once the lithium battery runs out, not charging will have an impact serious negative on the battery and will directly reduce the life of the lithium battery.
Nowadays, lithium batteries are commonly used in electronic products. When using lithium batteries, it is best not to deplete the battery before recharging, as this will reduce the battery's chemical activity. Therefore, when using electronic products on a daily basis, you should generally charge them when they still have more than 30% charge left. This is a more efficient method to extend the battery life cycle.
Second, lithium batteries being chemical batteriesues, after repeated use, a chemical reaction will occur between the battery electrolyte and the metal plate, and a passivation layer will appear on the surface of the metal plate. The passivation layer will prevent the generation and flow of current, increase the internal resistance of the battery and the power that the battery can provide will also decrease, causing the battery capacity to slowly decrease, making it less and less sustainable.
Detailed informationLithium battery maintenance precautions:
1. Charge correctly. The number of charges is closely related to battery life. You can use some auxiliary software to manage the battery or extend battery life with multiple micro-charges.
2. Try to use the original charger and data cable, or use charging equipment matching the output power of the chargerr and the original data cable.
3. Avoid excessive battery temperature. For example, when the body of electronic products such as mobile phones and tablets overheats, the batteries of electronic products will be quickly consumed regardless of whether they are used or not.
PersonnesNet-Are batteries in electronic products becoming less durable? The lifespan of 18650 lithium battery should be extended when the battery reaches 30%.
The repair method for 18650 lithium battery not charging step is as follows:
1. The reason why the 18650 cannot be charged is that the battery electrode contacts are rusty or dirty, making the contact resistance too large and the voltage drop too large. charging, the charging device thinks it is fully charged and stops charging; in this situation only, theElectrodes must be electrocuted for cleaning.
2. After eliminating the problem with the battery itself, check if there is a problem with the charger or charging cable. If there is other charging equipment, you can try to replace it, due to faults in the system. The charger and cable may also prevent the 18650 from charging.
3. If there is a problem with the internal circuit, the battery itself, or the battery life that is preventing the battery from charging, it is recommended to replace the battery directly. If you need to disassemble the 18650 battery, you must drain all the energy from the battery, but it is strongly not recommended to perform such an operation.
Principle of repair
1. Repair Principle 1: The metal surface of lithium batteries used for a long time will be oxidized to a certain extent, resulting in poor contact between the battery of themobile phone and mobile phone, the life of the lithium battery is shortened. The rust on the surface can be wiped off with an eraser or other cleaning tools, so that the battery and the mobile phone have better contact.
2. Repair Principle 2: Low temperature can change the electrolyte inside the lithium battery and promote the chemical reaction of the newly frozen battery. The process of using a lithium battery is actually a process of charging and discharging. During this time, the negative and positive charges of the battery collide.