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1. The origin of 12-14 hours: The first generation nickel cadmium batteries require low rate charging, and it is generally recommended to charge at 1/10C. For example, if your battery capacity is 600mAh, then 1C is 600mA, and 1/10C is 60mA. Therefore, it takes more than 10 hours to fully charge, and for nickel cadmium batteries, low rate charging is beneficial.

2. At present, the battery situation of mobile phones: Most mainstream mobile phones are lithium-ion batteries, and the closest one to our impression should be 3210. It is equipped with nickel hydrogen batteries, and it seems that there are no phones around us that use nickel hydrogen batteries.

3. Knowledge of lithium-ion batteries: We only talk about the capacity aspect. There are two testing methods for measuring the capacity of a lithium-ion battery: 1C charging and 0.2C discharging; 0.2C charging and 0.2C discharging, regardless of the charging system used, should meet the standards. Because lithium-ion batteries are different from previous nickel cadmium batteries, 1C high rate charging is already acceptable and must be accepted. If a 600mAh battery is charged at 1C, it should be fully charged in about 1 hour. If direct charging of a mobile phone is designed like this (many are 0.5C-0.8C), 12-14 hours is absurd.

According to the national standard GB/T182872000, when the constant current is charged to 4.2V and the voltage is changed to constant, the charging is considered terminated when the current drops to 0.01C. For example, if the charging current of the charger is 0.5C and a 600mAh battery is charged, the charging current will drop to 6mAh after about 2 hours, and it is considered fully charged. Why did it drop to 0.01C? Because it's already full, this is a reflection of the battery cells. In fact, for nickel hydrogen electricity, the national standard has also stipulated the indicators for high rate charging and discharging, and I won't talk much about it now.

4. What is "activation"? The lithium-ion battery itself is "live". If the designed capacity is 600mAh, although I can charge it for 2 hours and then discharge it, I can obtain a capacity of 600mAh. Once the designed capacity is reached, it is enough. What is the problem of whether it will be live or not? The technical supervision department implements national standards, and the testing capacity is charged with 1C and then discharged. One out of five times, the capacity is considered qualified. So use it normally and charge it normally. Just use the new battery like this and don't worry about it not being activated.

5. Charging for 14 hours is deceiving oneself: using a mobile phone to charge directly, it is already full in about 2 hours, and the remaining time is "baking" time. If there is an error in the charging control of the mobile phone (some), it is a test of the battery's time. Charging with a substandard seat charger (there are too many in the market) for 14 hours, your battery has passed a disaster before it even starts working for you. How heartless!

[Simple knowledge of nickel hydrogen batteries]

The nominal voltage (representing an approximate value of battery voltage) is nX1.2V. (Taking 3508 hydrogen battery as an example, n=3) Termination voltage (specified discharge termination): nX1.0V. Charging system: (constant current, starting from discharging at 0.2C to the termination voltage) 1. 0.4C charging: charging at 0.4C for 3.5h2. Full charging: charging at 0.1C for 16h. Discharge performance: (only one of them, closely related to everyone) 0.2C discharging: discharging at 0.2C to the termination voltage, the discharge time should not be less than 5h. The national technical supervision department has determined that the hydrogen capacitance is charged according to the charging system of 0.4C and discharged according to the discharging system of 0.2C. Complete charging is used to evaluate the storage performance of a battery. After 12 months of storage, it should be fully charged and discharged at 0.2C for no less than 4 hours. Overcharging performance: After charging at 0.4C, continue charging at 0.1C for 48 hours without deformation, night leakage, smoking, etc. The above is a brief description of the national standard GB/T18288-2000 for hydrogen electricity, from which we can see several issues:

1. For hydrogen batteries, complete charging has advantages, as it can charge more fully, which seems to be everyone's concept of activation.

2. However, complete charging is conditional, which is 0.1C. However, chargers on the market are not designed with such a small charging current (based on 3508 hydrogen, it should be 50mA). If a regular charger is used for 16 hours, either the charger has already cut off after being fully charged, the rest is a waste of time, or the trickle current after being fully charged causes overcharging. But the ability of hydrogen reactance overcharging is much stronger than that of lithium batteries. Even so, we shouldn't test it.

3. The concept of charging time of over 10 hours has been extended from hydrogen batteries, but it is no longer applicable to lithium batteries. The specifications for hydrogen electricity have a clause for complete charging, but there are conditions. And there are no corresponding terms for lithium batteries, only a pre cycle is given before testing, and the pre cycle charging is completed at a constant current of 4.2V, without any subsequent lateral voltage replenishment process. Lithium ion batteries do not require so-called "activation". There is no activation or deactivation process in battery manufacturers, and the batteries produced are all live. However, hydrogen batteries are not suitable for long-term storage as they will "die" over time. It is recommended that when hydrogen batteries are not in use, they undergo a charging and discharging cycle every three months and be fully charged and stored. The storage temperature should not be too high. (Do not buy items that have been illuminated by spotlights for a long time inside the counter, and do not buy items that have been stored for a long time)

4. The voltage of a fully charged hydrogen battery is nX1.45V, taking 3508 hydrogen as an example is 4.35V. For branded seat chargers on the market, if you are satisfied with hydrogen charging, you cannot charge a lithium battery. If you are satisfied with lithium charging, you will not be fully charged with hydrogen, but it will not be damaged. Because this type of charging does not have the ability to determine the type of battery, it only fixes a cut-off voltage. 5. So, the side of the travel charger we see in the market has a lithium or hydrogen battery selection switch, which actually switches the cutoff voltage.

6. Mobile phone batteries are a relatively new thing and are still in development. After about two years, China has formulated several standards, which were announced in April this year and implemented in July. I remember when we discussed it, we also considered various aspects and referred to many domestic and foreign standards, which should be more thoughtful and reasonable than everyone else's consideration. Moreover, new technologies, processes, and materials in the field of electrochemistry are constantly changing. The knowledge from the past is not entirely correct now, and even if the current correct concepts are changed under specific conditions, they will not hold true. For example, it is generally said that a seat charger is a low current slow charging method, which has advantages. However, if you buy one designed for high current, the above statement does not hold true and should not be judged based on its appearance. For example, the manual of MOTOROLA's phone states that the new battery needs to be charged for 14 hours, but Motorola (China) Electronics Co., Ltd. is the main drafter of GB/T18287, which is contradictory in itself. So, I think that for batteries and chargers, they should not be formulaic

1、 Basic concepts of lithium-ion batteries:

1. The nominal voltage of lithium-ion batteries is 3.7V (3.6V), and the charging cutoff voltage is 4.2V (4.1V, depending on the brand of the battery cell). (The specification for lithium-ion battery cells states: lithium-ion secondary batteries)

2. Requirements for charging lithium-ion batteries (GB/T182872000 specification): Firstly, constant current charging, which means the current is constant, and the battery voltage gradually increases with the charging process. When the terminal voltage of the battery reaches 4.2V (4.1V), constant current charging is changed to constant voltage charging, which means the voltage is constant. The current gradually decreases as the charging process continues based on the saturation degree of the battery cell. When it decreases to 0.01C, it is considered that the charging is terminated. (C is a representation method that compares the nominal capacity of the battery to the current. For example, if the battery has a capacity of 1000mAh, 1C is the charging current of 1000mA. Note that it is mA instead of mAh, and 0.01C is 10mA.) Of course, the standard representation is 0.01C5A, which I have simplified here.

3. Why is it believed that 0.01C is the end of charging? This is stipulated in the national standard GB/T18287-2000 and was also discussed. Previously, it was common to end with 20mA, and the industry standard YD/T998-1999 of the Ministry of Posts and Telecommunications also stipulated that regardless of the battery capacity, the stopping current is always 20mA. The 0.01C specified in the national standard helps to charge more fully, which is beneficial for the manufacturer to pass the appraisal. In addition, the national standard stipulates that the charging time should not exceed 8 hours, which means that even if the temperature has not yet reached 0.01C and 8 hours have passed, the charging is considered complete. Batteries with good quality should reach 0.01C within 8 hours, while batteries with poor quality are meaningless to wait for

4. How to distinguish whether a battery is 4.1V or 4.2V: Consumers cannot distinguish, this depends on the product specifications of the battery cell manufacturer. Some brands of battery cells are compatible with 41V and 4.2V, such as A&TB (Toshiba). Domestic manufacturers generally use 4.2V, but there are exceptions, such as Tianjin Lishen which uses 4.1V (but currently it is also used as 4.2V).

5. Charging a 4.1V battery cell to 4.2V will increase the battery capacity, make it feel very useful, increase standby time, but shorten the battery's lifespan. For example, the original 500 times were reduced to 300 times. Similarly, overcharging a 4.2V battery cell can also shorten its lifespan. Lithium ion batteries are very delicate.

6. Since there is a protective board inside the battery, can we rest assured? No, because the cut-off parameter of the protective board is 4.35V (which is still good, with a difference of 4.4 to 4.5V), the protective board is just in case. If it is overcharged every time, the battery will quickly decay.

7. What is the appropriate charging current? In theory, the smaller the charging current, the more beneficial it is for the battery. But you can't wait for three days just to charge a battery. According to the national standard, the low rate charging is 0.2C (arbitration charging standard). Taking the 1000mAh capacity battery mentioned above as an example, which is 200mA, we can estimate that this battery can be fully charged in over 5 hours. (Capacity mAh=current mA x time h) The national technical supervision department has determined the lithium capacity, which is charged at a high rate of 1C and discharged at a low rate of 0.2C. The capacity value is calculated based on time, and the test is conducted 5 times, with 1 time when the capacity reaches the end of the test. (There are 5 chances, if the first test is qualified, the next 4 tests will not be conducted) Before the test, a pre cycle is allowed, which is to charge at a constant current of 1C to 4.2V and then stop, without the subsequent process of constant voltage reaching 0.01C, let alone 14 hours.

8. How much charging current can lithium-ion batteries withstand: During manufacturer testing, it can be very high, but the national standard specifies a high rate of 1C. Taking the battery above as an example, it can be fully charged in just over an hour. Can the battery withstand such a large charging current? For current lithium-ion batteries, it's just a minor issue. At present, there is no national standard for chargers. The industry standard YD/T9981999/2 implemented by the Ministry of Posts and Telecommunications stipulates that the current of chargers should not exceed 1C.

9. How is the lifespan defined: Simply put, it refers to the capacity of a battery that decreases to 70% after N 1C charges and discharges, and N is the lifespan. It doesn't mean it can still be used 300 times, it can't be used 301 times. The national standard stipulates that the service life shall not be less than 300 times. The conditions we usually use are not as harsh as during testing, and the lifespan will be longer. After discussing so many concepts (don't bother, there's still a lot to say), we can finally talk about chargers. So, what is the current situation of chargers in the market?

2、 Types, quality, usage suggestions and analysis of chargers Direct charging:

1. Direct charging, the type that is directly plugged into a mobile phone. Some people like to call it a travel charger, but we are used to calling it "Huoniu". This type of charger comes with the phone, and the original quality is good. The highlight is that it can be charged and used immediately, so the charging current design is relatively large (strictly speaking, it is the charging current controlled by the phone), and the charging time is short. Some phones have a trickle charge after being fully charged, while others cut off immediately after being fully charged, and waiting on is futile. After reading the above concept, you should know that it is normal and there is no need to wait foolishly for 14 hours anymore. For the charging effect of direct charging, it also depends on the phone, because the charging control circuit is on the phone, and its cut-off voltage has a certain degree of discreteness. In my actual measurement of the same batch and model of phones, it is basically between 4.09V and 4.21V. That is to say, if 4.09V is cut off and not fully charged, it is not the most ideal capacity. Continuing to charge for a period of time may make it fuller. But don't forget, even for phones with trickle charging, just like the difference in charging voltage between 4.09 and 4.21, the trickle charging current of the phone also has a certain degree of discreteness. If the charging current is too high, it will become charging, which can be harmful to the battery for more than 10 hours. I have encountered many cases of battery failure on mobile phones, including original and branded batteries. If the battery is damaged and causes leakage, it may also damage the phone. Therefore, it is recommended that if you really want to recharge, it should be controlled within 2 hours and not more than 8 hours. My opinion is that lithium batteries are very delicate and can be fully charged. Measure it yourself, using a few hours less but half a year more each time, and using a few hours more but less than half a year each time. But when there are problems with original direct charging, we have encountered a high failure rate of direct charging in a batch of mobile phones. Fortunately, the fault is no voltage. If it is high voltage, it looks good. There are still a large number of non original turkeys on the market. The ones with good quality are fine, but the ones with poor quality can be imagined by yourself, because you are plugged into a 220V AC power source and the other end is on your phone... Therefore, in my personal opinion, it is not recommended to use non original turkeys. (At least the original one has a scapegoat for you if something goes wrong)

2. Seat charging has two slots, the front can hold the phone, and the back can hold the battery. It needs to be used in conjunction with a Taurus. The original seat charging has good quality, many of which are intelligent. Some brands can basically achieve a constant current and voltage charging process, and there is a trickle charging process after the charging is completed. Although some brands do not achieve a constant current and voltage process, accurate control of parameters such as current and voltage is also good.

The so-called intelligence is actually very simple. For example, the battery of MOTOROLA has a chip (read-only memory ROM) inside, which has solidified some codes. After the battery is inserted into the charger, the charger reads the codes and knows what type of battery it is. The corresponding charging process is executed, and everything is arranged in advance. (Different models, capacities, supply to different regions, and even different brands of battery cells have different codes)

To put it simply, if I shout 1, you will follow the first plan. If I shout 2, you will follow the second plan. I don't shout anything, or if I shout 3 but I don't agree with you beforehand, I refuse to execute. The phenomenon is that the charger's red light flashes and cannot be charged (non approved batteries are displayed on the phone). Not as many people imagine, there is a microcontroller CPU control.

"Intelligence" is also reflected in other aspects, such as the NTC (thermistor) and standard resistor of the battery. Different batteries have different standard resistors and chargers forming a circuit to determine the charging current. After the charging current is determined, another circuit is formed by the thermistor and charger according to different environmental temperatures to adjust the charging current. (Some batteries only have thermal resistance, some batteries only have standard resistance, and some batteries have both.)

For example, for a certain type of battery, the capacity of thin and thick batteries is different, and the optimal charging current should also be different. Therefore, the standard resistance of these two batteries is different, so that the charger "knows" how much charging current to give to thin batteries and how much charging current to give to thick batteries. In fact, the initiative is still on the side of the battery, and the charger only forms a circuit with the battery. Similarly, when the charging temperature changes, the resistance of the thermistor changes, forming a circuit with the charger to adjust the charging current, protect the battery, and avoid overheating. Now you know why there is a row of hardware contact plates on the battery and the battery compartment of the seat charger. Intelligence is just that.

Of course, at the same time, you also know what a qualified battery should do, right? Sometimes it's not enough to rely solely on a charger. If the battery is not made well, the charger won't work either. At present, many domestic batteries replace NTC with ordinary resistors to reduce costs, lose the function of current adjustment, and have unreasonable design and material selection. This is an aside from the point. Let's skip the table for now. (It also makes sense, just keep reading and it will be clear.)

The trickle charging current of the original seat charger is generally controlled accurately, but it is sufficient to recharge for 2 hours after the charger turns green. The same principle applies to lithium-ion batteries. It is sufficient to reach the capacity that the battery cells should have, and overcharging is not beneficial. Squeezing lithium batteries requires a lifespan, and occasionally 14 hours may not damage the battery, but getting used to it is not good. After talking about original seat chargers, it's time to talk about brand seat chargers in the market.

It can be said with certainty that none of the charging processes of brand seat chargers in the market strictly follow the charging process of constant current and constant voltage (if there are any, please let me know and I will buy them). They can be roughly divided into several categories:

A. Constant voltage, non trickle charging: The battery stops charging when it reaches 4.2V. When encountering this type of charging, waiting for 14 hours is deceiving yourself. Although it has reached 4.2V, it has already stopped and there is no trickle process, so it has not been fully charged. In order to fully charge, some designs come with losses, changing the cut-off voltage to 4.25V or above, and some even design to wait for the battery's protective plate to cut off. If the battery is fully charged like this, you will definitely be satisfied with this seat charge, but your battery life has decreased. This charger is overcharged and works well without waiting for 14 hours.

B. Constant voltage, using a fixed trickle current for charging: a conscientious design that has been improved. When charged to 4.2V cut-off, a fixed resistor is used to "leak" some current out. This trickle current is fixed and will never stop when the battery is plugged in. According to my measurements, it is generally around 30 to 50mA. Using this charger, when the green light is turned on, it is not fully charged. It is ideal to continue charging for about 2 hours, but the trickle current is too high, and continuing to charge for 14 hours is not beneficial for the battery.

C. Constant voltage, also known as intelligent pulse type: the battery is charged to a cut-off voltage of 4.2V and then recharged with a trickle current pulse. This is a so-called high-end model with a good design concept, but unfortunately, the product is not competitive and has poor consistency, which means that what you buy may be good or bad. The drawback of my measurement is that the pulse current is too high, ranging from 50 to 100mA, and the pulse is too dense, which is equivalent to charging. It's expensive, so it's better to use B.

It is worth noting that some battery chargers are designed with a high charging current, close to 1C, in pursuit of the fast effect of direct charging by the Fire Bull. Although this type of battery charger does not violate industry standards, it cannot be simply understood as "low current slow charging". However, I do not recommend using this type of seat charger. The above is just a summary. In order to pursue "charging effect", there are also practices such as "overcharging with trickle current compensation", "overcharging with pulse", and "fast overcharging with compensation". What they need is to leave a good impression on the user. When the user's battery runs out, they basically won't blame the charger. At most, they can curse one sentence: break the battery, only use it for half a year!

A simple method to choose a seat charger:

I won't talk about the physical appearance and other aspects, only the electrical aspect. When choosing a seat charger, it is best to have a digital multimeter. Insert the empty battery into the charger and connect it in series to measure the charging current. The range of 250 to 350mA is more suitable. After the charger turns green, immediately remove the battery voltage, which is normal between 4.15 and 4.20. After turning green, connect the multimeter in series to observe the current. The range of 30 to 50mA is more suitable. If you can choose a domestically produced seat charger like this, you can use it without any problems. Why spend money on the original one? Of course, I mean domestically produced products that meet the standards and are qualified.

It should be noted that:

Brand seat chargers lack intelligence, and the row of hardware contact pieces, except for the positive and negative poles, are all placed for you to see (some have a thermistor contact end useful). But after understanding the implementation method of original seat charging intelligence, there is no need to be too mysterious or pursue intelligence. (Now you know why some batteries mentioned above need to simplify materials?) Product parameters have a certain degree of discreteness. Some brands have a charging cut-off voltage exceeding 4.2V, but as long as it does not exceed 4.25V, there is a certain amount of error allowed, which has an impact on the battery, but the impact is not significant. (I have measured the original MOTOROLA, and the highest one is 4.23V)

[III. Types, Quality and Usage Suggestions of Chargers and Analysis of Travel Chargers]

When I say travel charging, it refers to the type where a battery is placed and directly plugged into an AC power source for charging, and it should not be confused with the type where a phone is directly plugged into a Taurus for charging. The characteristic of a travel charger is its convenient use, without the need to prepare two things like a seat charger. Even if there is a problem, it will not affect the phone.

Simply put, travel charging is the integration of the battery charging part of the Taurus and the seat charger. The early travel charging sources were only simple capacitor voltage reduction circuits, which were prone to malfunctions and were not safe. At present, most travel chargers are switch mode power supplies with good stability (of course, it also depends on the brand). I randomly checked and tested 5 GD93 travel chargers. They were plugged into the AC power supply for three days and three nights, and when the battery was fully charged, they were replaced. They worked continuously for a long time without any problems. Of course, just because I have no problem here doesn't mean you won't have any problems. Users should unplug the travel charger from AC power after charging. Some travel chargers are labeled with intelligence and CPU control, which is the responsibility of the manufacturer. Don't believe it.

What does it matter if there is no intelligence when choosing a travel charger based on the points of choosing a seat charger? Domestic ones are also very useful. Of course, I mean domestically produced products that meet the standards and are qualified. I don't want to say more. Chargers are really diverse, and I haven't included any counterfeit or substandard ones yet. Different products, different brands, different periods, different situations, everyone's concept cannot remain unchanged. Especially, millions of substandard chargers on the market each month are actually in the hands of consumers. Improper use of these chargers can easily damage the battery, such as charging for 14 hours, and so on.

My suggestion is: for original direct charging, add 2 hours to full charge; For domestic direct charging, no need; For original seat chargers, be casual (but not too casual); For domestic seat chargers, it takes 2 hours to fully charge, and for domestic travel chargers, it takes 1 hour to fully charge. Domestic refers to qualified products that meet the standards. The above is just a suggestion and may not be very accurate, but in short, there is no need to charge for 14 hours. Even with a new battery, as long as it is a lithium battery, there is no concept of "activation", which is another point to say. How do I charge it? I am: looking for a charger that can overcharge and charge the battery to 4.25V or above. It is very useful and extends a lot of time. But my battery cell is broken and needs to be replaced immediately. What I am pursuing is standby time, not battery life. What about you guys?

The production process of lithium battery cells and mobile phone batteries

The production process of lithium battery cells does not mention the material preparation, winding, liquid injection, packaging and other processes mentioned earlier, but only the final formation and capacitance process that is related to us. Each packaged lithium battery cell is clipped into a separate cabinet like a vertical cabinet. There are many vertical cabinets like this in battery cell factories, arranged in rows, and each cabinet can hold hundreds of cells, or hundreds of detection points. In fact, these cabinets are like chargers, but they can simultaneously charge a large number of battery cells and obtain data from each detection point through computer management. Lithium battery cells are formed here to obtain capacity, and the size of the capacity is known, which is called capacity division. By dividing the capacity, the level of the battery cell has been determined, such as 063048, which is considered to be between 700 and 750mAh, while only between 650 and 700mAh is considered to be level B. So in the future, * * can be sold for a few more yuan, while B-grade can be sold at a low price, and C-grade can be sold at a low price to "knockoff" factories specializing in processing * * batteries. (Of course, determining the level also depends on internal resistance and other indicators.) From this point, we can see that lithium batteries are "charged" after production, not in a state that some people think is "dead", but needs to be "activated" before use.

Lithium battery cells produced cannot be sold immediately and should be stored for at least 15 days. During this period, some inherent drawbacks may manifest, such as excessive self discharge. Cells that have reached their storage period in the warehouse will be taken out for retesting and capacity division after receiving an order. This means recharging and discharging the batteries again, eliminating those that do not meet the capacity level or have quality problems, and then handing them over to the sales department to maintain about 50% of the battery capacity, and finally to the mobile phone battery block assembly factory. From this point, we can also see that the battery cells are "charged" when they leave the factory.

Battery assembly factories generally have capacity sharing equipment, but their scale is not as large as that of cell production factories. After receiving the cells from the cell factory, in order to avoid being deceived by the cell factory and be responsible to consumers, the cells that will be used for battery assembly are divided again. Through this process, some cells that do not meet the requirements can always be selected and returned or exchanged with the cell factory. We can see that the battery cells have undergone charging and discharging again, and are "charged". So it's normal for some customers to have two bars of battery when they receive it. After these processes, there is no concept of "activation" in batteries.

Some original batteries cannot be turned on at the beginning of purchase due to several reasons. Firstly, the protection board is deadlocked, and the battery does not output voltage. This type of battery will restore voltage immediately after charging, and it will be activated. Another reason is that the storage time is too long, because the original mobile phone battery is almost not produced by the phone factory. The battery may take a long time from production to matching with the phone and then to reaching consumers. At this time, the voltage of the battery cell drops to below 2.5V, while the lower limit cut-off voltage of the protection board is 2.5V. At this time, the battery does not output, but it does not prove that the battery cell is not charged. If the battery cell is above 2.2V, it is still "alive". For such batteries, we can use them for normal charging.

For example, if a battery has gone through 3 rounds of 14 hour charging, but I don't say, I sold it to you, and you don't know, is it still necessary to do 3 rounds of 14 hour charging? (Of course, the above capacitive process did not last for 14 hours, but it was all based on reaching the design capacity of the battery cell for testing.)

Is it possible to extend the time by charging for 14 hours? Absolutely, but that's overcharging, squeezing the battery cells. Overcharging will shorten the lifespan of lithium batteries. If you want to extend the usage time, the correct approach is to use new high-capacity battery cells and improve battery products, rather than squeezing existing cells. For example, the MOTOROLAV998 lithium battery has a labeled capacity of 580mAh. The original battery was originally equipped with Panasonic 30486 battery cells (although not just Panasonic), with a nominal capacity of 600mAh. However, some batteries can actually reach a capacity of 690mAh. Even if pressed, they cannot match the current mainstream brand's 063048 battery cell style, which has basically reached 750mAh. This is why people use Tencent gift batteries with a standby time longer than the original battery (although it is not absolute, some original batteries also use large capacity cells, although the capacity printed on the label is still 58mAh). 0mAh (unchanged).

When you get a new phone, you often try to set up its features, learn how to use it, and keep playing with it. Although you haven't made a phone call, the power consumption at this time is also amazing. In other words, even if you haven't made a phone call and only sent a few short messages, and input Chinese characters for a long time, the power consumption is also amazing. The so-called amazing refers to the amount of battery used in pure standby mode. After waiting for a few days, the phone was no longer fresh and the battery was saved. I felt that the battery was working well.

Lithium ion batteries will experience a capacity decay of several percent after 20-50 charge and discharge cycles, and then the capacity will stabilize, with larger ones even reaching around 6%. Since this is the case, why wait for three to 14 hours at the beginning, knowing that there will be a decay in the future?

In fact, the fundamental point is that mobile phones serve people, not people.

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