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The more the lithium battery is discharged, the greater the loss of the battery will be. "Tom Hartley, a professor of electronic engineering at Akron University who helped NASA study the extension of the battery life, said," The more fully the battery is charged, the greater the loss of the battery will be. The lithium battery should be in the middle state of charge, and then the battery life will be the longest. "

First of all, too high and too low power state has the most adverse impact on the life of lithium battery, while the number of charge-discharge cycles is secondary. In fact, the number of rechargeable times marked on most electric appliances or batteries sold is based on 80% discharge. The experiment shows that for some notebook lithium batteries, the battery voltage often exceeds the standard voltage by 0.1 volts, that is, from 4.1 volts to 4.2 volts, then the battery life will be reduced by half, and then by 0.1 volts, the battery life will be reduced by one third of the original; Long-term low power or no power status will make the internal resistance of the battery to the movement of electrons more and more large, which will lead to smaller battery capacity. NASA set the power consumption of the batteries on its Hubble Space Telescope at 10% of the total capacity to ensure that the batteries can be recharged and discharged for 100000 times without renewal.

The power consumption of the battery on the Hubble Space Telescope is set at 10% of the total capacity, and the number of battery charging and discharging cycles can reach 100000

Secondly, temperature also has a great impact on the life of lithium batteries (mobile phones and other small electronic devices can be ignored). The environment below the freezing point may cause the lithium battery to burn out at the moment of opening the electronic product, while the overheated environment will reduce the battery capacity. Therefore, if the laptop uses the external power supply for a long time without removing the battery, the battery will be in the high heat discharged by the laptop for a long time. What's more, the battery will be in the state of 100% power for a long time, and will soon be scrapped (including my own laptop battery).

There is no need to charge the lithium battery to 100% full, let alone use up the power. If possible, try to keep the battery power near the half-full state, and the smaller the range of charging and discharging, the better;

The factory design of the General Chevy Volt electric car is to force the battery power to be maintained at 20% to 80%, and the built-in battery of Apple's laptop may also use this method (including some other laptops and electronic products) to increase the number of rechargeable and discharging cycles of the battery.

Do not use lithium battery (especially notebook lithium battery) for a long time when the equipment uses external power supply. Even if your laptop has a good heat dissipation, 100% of the power for a long time is equal to the murder of lithium batteries.

1. If you use the external power supply to power the laptop for a long time, or the battery power has exceeded 80%, immediately remove the battery of your laptop, and do not need to fully charge the battery at ordinary times, just charge it to about 80%; Adjust the power option of the operating system, and set the power alarm to more than 20%. Usually, the minimum battery power should not be less than 20%. The battery should be charged before it drops to 20%;

2. For small electronic devices such as mobile phones, disconnect the power cord (including the USB interface of the charging function) immediately after charging, which will damage the battery all the time; You should always charge it, remember it, but you don't have to fill the battery;

3. Do not let the battery run out, whether for laptops or mobile phones;

4. If you want to travel, please fill the battery, but please remember to charge the electric appliance at any time when conditions permit. For the battery life, do not wait until the battery is dry;

Nowadays, people have many electronic devices, and a large part of them use lithium batteries. It is very practical to ensure the battery life. After all, the battery should be recycled after being scrapped, otherwise it will cause serious pollution to the environment.

1. [Charge before use] Generally, the new NiMH battery only contains a small amount of electricity. After you buy it, you should charge it before using it. However, if the battery has a short delivery time and sufficient power, it is recommended to use it before charging.

2. [Best performance after 3 times of charging] The newly purchased NiMH battery generally needs 3-4 times of charging and use before its performance can be brought into full play. Many friends encounter small problems during the first charging. For example, the number of PPs taken after the first charging is not as many as you think? After 3-4 times of charging and use, it will be solved.

3. [Recharge after use] Although the memory effect of NiMH battery is small, it is still recommended that you try to recharge it after each use, and it is a one-time recharge. Do not recharge it for a while and then recharge it. This is an important point of "prolonging life".

4. [Pay attention to heat dissipation and keep clean] When charging the battery, pay attention to the heat dissipation around the charger. It is unnecessary to use any fan to blow too deliberately, but it is important to note that too many sundries should not be placed around the charger. In the process of using batteries, ordinary users often do not have special storage bags; After replacing the battery, the user will habitually put the battery away, regardless of whether the place is clean and wet. The result is that the battery is easy to get dirty, the contacts are easy to contact with metals such as keys, and easy to get damp, which are the enemies of the battery. Suggestion: The user should set a special storage point for the battery and keep the battery clean. In order to avoid power loss and other problems, keep the contact points at both ends of the battery and the inside of the battery cover clean, and use a soft, clean dry cloth to wipe gently if necessary.

5. [Long-term use, careful storage] When not in use for a long time, remember to take the battery out of the battery compartment and place it in a dry environment. It is recommended to put it in the battery box of the brand to avoid battery short circuit.

6. [It is advisable to store the battery with electricity for a long time, and reuse it slowly] The nickel-metal hydride battery that has not been used for a long time will naturally enter a "sleep" state after several months of storage, and the battery life will be greatly reduced. If the NiMH battery has been stored for a long time, it is recommended that you charge it slowly first. Here is another key issue: For NiMH batteries, should they be stored after full discharge or live storage? Which of these two different views should be adopted? Many people believe that the former should be adopted, but the author believes that it is reasonable to keep the battery charged. Because: according to the test, the best condition for the storage of NiMH battery is about 80% when it is charged. This is because the self-discharge of the NiMH battery is relatively large (about 10% - 15% a month). If the battery is stored after full discharge and not used for a long time, the self-discharge of the battery will cause the battery to over-discharge and damage the battery. Don't believe it? Then think about whether the newly purchased NiMH rechargeable batteries still have electricity. That's why. Suggestion: compare more, correct wrong opinions, and maintain the battery in the right direction, otherwise it will backfire.

7. [Don't over discharge Ni-H battery] Many friends posted a post asking how to discharge NiMH? After asking a lot of battery experts, they reached a consistent conclusion to remind friends. Try not to discharge the NiMH battery. Overdischarge will lead to charging failure, which is far more harmful than the memory effect of the NiMH battery itself!

8. [NiH<1.2V before charging,>1.4V after charging] The multimeter checks whether the battery is fully charged or not. Generally, the voltage of NiMH battery is below 1.2V before charging, and the normal voltage is about 1.4V after charging. It is easy to judge the state of the battery.

9. [Fast charging is harmful, brand name is good] Chargers are mainly divided into fast charging and slow charging. The slow charging current is small, usually about 200mA, for example, our common charging current is about 160mA. Her charging time is long. It takes about 16 hours to charge 1800mAh NiMH battery. Although the time is a little slow, it will be fully charged without damaging the battery. The fast charging current is usually more than 400mA, and the charging time is significantly reduced. It can be completed in 3-4 hours, which has won everyone's love. There are many types of fast charging, and the prices are different. So we often have questions about why the price is so different with fast charging? Good chargers, especially good fast chargers, have anti-overcharging protection functions. For example, our common Panasonic charger BQ390 performs particularly well in this regard. The excellent chip software design ability also minimizes the damage of fast charging to the battery when charging the battery.

10. [Fast charging multiple times and slow charging recovery] The contradiction appears: slow charging does not damage the battery, but the charging time is too long; Fast charging can save time, but it will harm the battery. Even the best Panasonic charger BQ390 in the world can only reduce the degree of damage, but it cannot be completely avoided. The way to solve the problem is to buy a fast charge and a slow charge. Use fast charging for a period of time, for example, after 5 or 10 times, use slow charging for one or two times. This will restore the performance of the battery to the best state.

11. [Use of the same brand and same number at the same time] When the battery is used, it is usually a battery pack, that is, 4 or 6 batteries are connected in series. At this time, it is important to maintain the balance of each battery, otherwise the work of the entire battery pack will be affected because of the problem of one of the batteries. First of all, ensure that the battery capacity is consistent, and it is best to choose the same brand and model of batteries purchased at the same time. Then, to keep the internal power of the battery consistent, in short, the battery pack is either full or empty. If there are more batteries to form several battery packs, you can try to "select" them. Specifically, connect battery cells with similar capacity, voltage and other parameters in series to form a group of battery packs. Due to insufficient conditions, it is generally enough to measure the voltage after lowering the point and the charged voltage.

12. Finally, let's talk about charging and discharging. The high-end NI-MH charger uses - DELTAV to detect the battery voltage to determine whether the battery is fully charged. The voltage curve of the battery during charging is somewhat similar to that during discharging. It rises rapidly at the beginning, and then rises slowly. When the battery is fully charged, the voltage starts to decline rapidly again, but the decline is not very large. The previously used nickel-cadmium battery is similar, but the speed and range of decline are greater than NI-MH. The most popular chargers in the market (the cheaper ones) often use constant voltage charging. For example, the old GP charging bank is 1.4V constant voltage, which means that when the battery is charged to 1.4V, there is no pressure difference, and the charging is over. As a result, the battery is often unable to be fully charged, especially for some older batteries, due to the increase of internal resistance, the actual voltage applied to the battery is lower. Moreover, the current of this kind of charger is often small, and it often takes more than 10 hours to charge. The charger with - DELTAV automatic cut-off can reliably use high current charging because it can accurately control the charging time. The damage of high current charging to NiMH batteries is not as great as we thought. On the contrary, the current use of DC requires high current charging. First of all, it's time. Then, NiMH battery has a characteristic, that is, the greater the current you charge, the greater the current it can emit. Now DC is a power slot, and the current is not small. Therefore, it is a wise choice to charge with a relatively large current, which can make the battery cleaner. Generally, the charging current of No. 5 should not exceed 1.5C, C is the battery capacity, that is, the battery of 1000MAH, should not exceed 1.5A. I usually charge at 0.5C (my charger can adjust the current). In terms of discharge, in general, the DC can be charged after the screen is black, and the NI-MH memory effect is very small. However, after a period of use, and when balancing and activating the battery, it is necessary to control the termination voltage of battery discharge. The termination voltage of the NI-MH battery is 0.9V. Pay attention not to over-discharge when discharging, and discharge can be stopped when each battery is at 0.9V. NI-MH battery is not as strong as nickel-cadmium battery, and is sensitive to overcharge, over-discharge and high temperature. Charge and discharge temperature. Generally speaking, do not let the temperature of the battery be higher than 45 degrees. When the battery is fully charged, the battery will heat up. The temperature should be about 42 degrees when the battery is fully charged with large current, not more than 45 degrees, otherwise the life will be reduced quickly, and the internal resistance of the battery will increase. In addition, the temperature of the battery after charging is high, so it can be charged only after cooling, and the charge money also needs to wait for the battery to cool. Reuse after a long time of use. It is better to recharge and discharge the battery several times to reactivate it. During normal use, pay attention to keep the package intact and free from damage to avoid short circuit. Do not hit the battery or burn it.

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