How to activate 26650 lithium battery，Regarding the activation method of lithium batteries:
The currently recognized basic principle of lithium batteries is the so-called "rocking chair theory". The charging and discharging of lithium batteries are not achieved through traditional methods of electron transfer. In childhood, energy changes occur through the entry and exit of lithium ions in the crystals of layered materials. Under normal charge and discharge conditions, the entry and exit of lithium ions generally only cause changes in interlayer spacing, without causing damage to the crystal structure. Therefore, from the perspective of charge and discharge reactions, lithium-ion batteries are an ideal reversible battery. During charging and discharging, lithium ions move back and forth between the positive and negative electrodes of the battery, just like a rocking chair swaying back and forth between the positive and negative electrodes. Therefore, some people refer to lithium-ion batteries as rocking chair batteries.
Misconceptions in the daily use of lithium batteries. For the issue of "activation" of lithium batteries, many opinions suggest that the charging time must exceed 12 hours and be repeated three times in order to activate the battery. The statement that 'the first three charges should be charged for more than 12 hours' is clearly a continuation of nickel batteries such as nickel cadmium and nickel hydrogen. So this statement can be said to have been a misconception from the beginning. After a sampling survey, it can be seen that a considerable number of people have confused the charging methods of the two batteries.
There is a significant difference in the charging and discharging characteristics between lithium batteries and nickel batteries. All the serious formal technical materials reviewed emphasize that overcharging and overdischarging can cause huge damage to lithium batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge according to standard time and methods, especially not for over 12 hours of ultra long charging.
Usually, the charging method described in the phone manual is the standard charging method suitable for the phone.
In addition, lithium battery phones or chargers will automatically stop charging after the battery is fully charged, and there is no so-called "trickle" charging that lasts for more than 10 hours with nickel chargers. That is to say, if your lithium battery is fully charged and placed on a charger, it will still be charged for nothing. And none of us can guarantee that the characteristics of the battery's charge and discharge protection circuit will never change and the quality will be foolproof, so your battery will be hovering on the edge of danger for a long time. This is also another reason why we oppose long charging.
Cycle life (10% DOD):>1000 cycles
Cycle life (100% DOD):>200 cycles
DOD stands for Depth of Discharge. From the table, it can be seen that the number of rechargeable cycles is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that at 100% DOD. of course
If converted to the actual relative total charging capacity: 10% * 1000=100, 100% * 200=200, the latter's complete charging and discharging is still better. However, the lifespan of lithium batteries is mainly reflected in the charging and discharging cycle, which is an absolute concept. The last time they used 30% electricity, they were fully charged, and the next time they used 70% electricity, they were fully charged again. This happens to be a charging cycle. So we still follow the slogan of the inventor of lithium batteries, 'Charge and use immediately, charge and use immediately', when using lithium batteries.
Excessive charging and complete depletion of battery life can lead to overcharging and overdischarging, causing permanent damage to the positive and negative electrodes of lithium-ion batteries. At the molecular level, overdischarging can cause excessive release of lithium ions from the negative carbon, leading to the collapse of its layered structure. Overcharging can force too many lithium ions into the negative carbon structure, making it impossible for some of them to be released. This is also why lithium-ion batteries are usually equipped with control circuits for charging and discharging. Lithium ion batteries generally come with a management chip and a charging control chip. The management chip contains a series of registers that store values such as capacity, temperature, ID, charging status, and discharge times. These values will gradually change during use. The main purpose of the "fully charged and discharged once a month or so" method in the instructions should be to correct inappropriate values in these registers, so that the charging control and nominal capacity of the battery match the actual situation of the battery. The power statistics chip can sample and calculate the battery's power by recording the discharge curve (voltage, current, time), which is what we read in BatteryInformation However, after multiple uses, the discharge curve of lithium-ion batteries will change. If the chip does not have the opportunity to read the complete discharge curve again, the calculated power will be inaccurate. Therefore, we need deep charging and discharging to calibrate the battery chip.
The correct method for the first three charges of
lithium batteries and precautions for daily use.
There is no need to charge the battery for an extended period of time, such as 12 hours, to activate it during the first three charges. The charging circuit is already protected and it is useless to plug it in.
During regular use, it is advisable to avoid complete discharge (until the black screen is turned off). The best way is to purchase a second battery and replace it in a timely manner.
After being left unused for a long time or frequently charged and used for a period of time, the method is to fully charge and discharge the battery once, and then the battery can be charged immediately. Only after a long period of use does it need to be fully charged and discharged again for recalibration.
If a long battery is not needed, it is recommended to charge it to 40% before placing it to protect the battery.
Finally, the lifespan of lithium batteries is mainly reflected in the charging and discharging cycle, which is an absolute concept. The last time they used 30% electricity, they were fully charged, and the next time they used 70% electricity, they were fully charged again. This happens to be a charging cycle.
When should charging start during normal use:
We often see this statement: because the number of charge and discharge cycles is limited, the phone battery should be used up as much as possible before recharging. However, this statement is clearly incorrect! Under normal circumstances, you should charge the battery according to the principle of using up the remaining power before recharging (but definitely not using it to shut down and recharge). If your battery cannot last the entire day on the second day, you should start charging in a timely manner! And when you need to charge to cope with an important event that is expected to cause busy communication, even when the battery still has a lot of remaining power, you just need to charge in advance because you haven't really lost a charging cycle life! The principle of recharging after the remaining battery power is not to go to extremes. A widely circulated saying, like long charging, is "try to use up the battery of your phone as much as possible, preferably with automatic shutdown". This approach is actually only used on nickel batteries to avoid the occurrence of "memory effect", unfortunately it has also been passed down in lithium batteries today. There was an example of someone who continued to use their phone without charging it even after receiving a warning of low battery level and continued to use it until it automatically shut down. As a result, the phone in this example did not respond during subsequent charging and startup, and had to be sent for maintenance. This is actually due to the low voltage caused by excessive discharge of the battery, resulting in the inability to have normal charging and startup conditions. Practical experience has proven that the scrap rate of lithium batteries with a discharge depth of 100% is 50% (years of evidence have shown that only half of lithium batteries with a discharge depth of over 99% can be activated by maintenance power sources, and the remaining half are scrapped!)
The correct approach for lithium battery smartphones:
In summary, the most important tips for the charging and discharging issues of lithium battery smartphones during use are:
1. Charge according to the standard time and procedure, even for the first three times. First, plug the charger (wire charging) into the power supply, and then plug the output terminal of the charger into the phone charging port. Someone may ask: is it better to charge when turned on or when turned off? Answer: It's okay! A few brands of mobile phones cannot charge the backup battery (the small lithium battery on the motherboard that powers the 32.768 clock crystal) when turned off. Only direct charging can be used to charge the backup battery in standby mode!
2. When there is a low battery prompt on the phone, it is advisable to start charging as soon as possible; Lithium batteries are most susceptible to damage during over discharge!
3. The activation of lithium batteries does not require any special method, as they will naturally activate during normal use of the phone. If you insist on using the first three 12 hour long charging "activation" methods that have been circulating, it will not actually be effective.
Generally speaking, depending on the size of the battery capacity, the charging time is between 2-4 hours. Therefore, pursuing 12 hour long charging and using lithium battery phones for automatic shutdown are all wrong!
