In the use of lithium batteries should be noted that for a period of time after the battery is placed into hibernation, lower than normal capacity at this time, the time has also come to shorten. However, lithium batteries can easily activated, as long as after 3-5 times the normal charge-discharge cycle of the battery can be activated, the resumption of normal capacity. As the laptop battery lithium own characteristics, its decision is almost no memory effect. Therefore, cell phone users in a new lithium battery in the activation process does not require special methods and equipment. Not only is the theory that, from my own practice, from the very beginning, a standard method of charging that “activation” is the best way.

Lithium batteries for the “activation”, a large number of claims: the time to charge more than 12 hours, repeated three times to do in order to activate the battery. “The first three necessary and sufficient to charge more than 12 hours”, it is obvious from the nickel battery (such as nickel-cadmium and nickel metal hydride) inherited. This is why it can be said is the beginning of miscommunication. Lithium batteries and nickel battery charge and discharge characteristics of a very big difference, but also very clear to tell you that I have had access to all the serious official stressed that all technical information and charge-off will discharge lithium batteries, especially lithium liquid Ion battery causing great harm. According to the charge and therefore the best time and method of charging standards, in particular for not more than 12 hours of super-long charge. Typically, the statement introduced mobile phone charging method is suitable for the mobile phone standard method of charging.

Li-ion powerbook battery in the phone or battery charger will automatically stop after a charge, there is no electricity nickel charger for 10 hours the so-called “trickle” charge. In other words, if your lithium batteries in full, on the white charger is also sufficient. And we can not guarantee that no one battery charge and discharge protection circuit features and never change the quality of safety, so your batteries will be in the long-term hovering on the brink of danger. This is also against our long Another reason for the charge.

In some of the phone, charging more than a certain amount of time, if not remove the charger, this time not only to stop charging system, will be the beginning of discharge - charge cycle. This is perhaps the manufacturer has its own purpose, it is clear that on the phone and battery / charger is the life span of a negative. At the same time, long charging would take a long time, often at night, and to our country’s power grid situation, at night in many parts of the relatively high voltage, but also volatile. Said earlier, the lithium A1148 is very delicate than nickel in the electric charge and discharge aspects of fluctuations in the capacity of resistance is much less, so this brings additional risk. Can not be ignored other aspects of lithium batteries is not the same for over-discharge, over-discharge of lithium batteries is also very unfavorable.

 In the lithium-ion laptop battery management system, the need for a single battery in the battery voltage detection. Application is now more direct sampling method, the method is not only complex, in the practical application of the battery pack will also affect the consistency. Many factors, however, can not ignore the impact of the circuit. The author of this article through a practical voltage detection circuit, the circuit analysis of the performance of batteries using the Inspiron 1100 battery  model analysis of the impact of the causes and put forward to reduce the impact.

In the sony battery   voltage measurement system is difficult: how to detect the series in every single battery voltage of the batteries, which are to be compared with the common voltage reference, so as to facilitate the sampling voltage signal. The safety of lithium-ion battery voltage in general 2.7 ~ 4.2V, so the reference voltage of 5V of the A / D converter, single-voltage battery is in this. If the reference is not systematic, then only the first n the battery voltage will be the only pre-n and the battery voltage, which has exceeded the A / D conversion reference voltage range, the voltage through the measurement into the system compared with the same reference Is essential to.

Experiments using the same 10 lithium-ion battery, rated capacity of 3Ah, batteries used in series structure of the battery pack through the cycle of experiments conducted to test the dynamic process of lithium-ion battery pack. In the experimental battery pack before the first single cells on the 3rd cycle, so that the capacity and stability. The battery charge and discharge system: 0.50C constant current charge to 42V, and then charging voltage to 42V to reduce the current 0.05C up; battery discharge current 0.50C to 30V. In the course of the experiment, the single battery protection: protection of the charge-off 4.35V, over-discharge protection of 2.50V.

The author of this article for the design of a practical battery voltage measurement circuits, as shown in Figure 1, which is composed of subtraction op amp circuits, each battery voltage Vn ‘corresponds to a subtraction circuit. Vn + for only the first n positive relative to the land of the battery voltage, Vn-for the first n only relative to the negative battery voltage of the earth.

10 because of lithium-ion battery pack maximum voltage of about 42V, for the operational amplifier, more than the maximum voltage, the subtraction in the circuit used in voltage attenuation, and then proceed to enlarge. As part of the enlarged use of the same magnification, it can be simulated on the switch, so the whole detection circuit only need one amplifier can be cost-effective.

In actual use, 10 times in order to ensure the accuracy of voltage attenuation, the use of R resistance 33kΩ (1% accuracy). Because of the large high-precision resistors made special needs, but also expensive. In the experimental battery pack in the performance of a marked decline, shown in Figure 2. 52 times the previous cycle (0.5C charge and discharge), the Asus battery  pack, single battery voltage discharge cut-off that there are great differences, with the cycle, the order they were asked, “lining up” phenomenon more obvious, but also in the first About 30 cycles, battery discharge yet to 30V, the first of a battery voltage discharge has been in a state of protection, resulting in the termination of the discharge of the battery, battery pack all of a sudden reduction in capacity. In order to verify the online testing is caused by leakage current, 52 cycles, the battery pack in a first and 10 for the battery exchange, the continued cycle of experiments and found that: 10 of the battery discharge termination A slight drop in voltage, and a section of the termination of the discharge voltage has been greatly improved; due to the original article is no longer in a battery discharge over the protection of state, the No. 2 battery which had a discharge protection. Experiment over: the voltage detection circuit to a certain extent there is leakage, which were measured,

In the charging process, the circuit of the charge current detection through each line voltage detection circuit to be part of the current points out that the closer the negative battery cell, the more diversion, so that the charging process, the more Close to the battery cathode battery charge current greater. Discharge process is the same, the more close to the battery anode, the smaller the battery discharge current. Throughout the cycle, close to the cathode of the battery cell, in charge of electricity, out of less electricity; and close to the negative battery into the battery power of a small, and the release of more electricity, which is caused by the 8027U battery pack inconsistency . With the cycle, exacerbated by inconsistency, even if the battery’s initial state, as a result of the cumulative effect exists, so that the battery pack in the course of the cycle as a result of leakage and inconsistent, although relatively small leakage, but the Dorgan-ray detection As well as the cumulative long-term, it will affect the consistency of the F2299A battery pack.

In order to reduce leakage current, increased test taking input impedance, or resistance to R into 200kΩ (1% accuracy), because the resistance of resistance deviation greater precision, experimental results show that: current leakage significantly reduced. Will be revised voltage detection circuit, in accordance with the above-mentioned experimental battery system to do the experimental cycle. The results compared with Figure 2, voltage detection circuit to the battery pack in the single battery voltage discharge termination of the impact has been a lot of small, but the battery pack in the single battery voltage discharge or terminate the order they will be “lining up” phenomenon .

1. Battery factory, manufacturers have been activated to deal with, and the pre-charging, the batteries have more than electricity, a friend of mine said that the battery in accordance with the adjustment period recharged, the standby is still a serious shortage of the assumption that the battery had to be really authentic, then the laptop battery, in which case Adjustment period should be extended for a further 3 to 5 times full charge and discharge.
2. If you buy a new cell phone battery is a lithium-ion, 3 to 5 times before the charge commonly referred to as an adjustment period, more than 14 hours should be sufficient to ensure the full activation of the lithium-ion activity. Lithium-ion battery memory effect did not, but there is a strong inert, should be fully activated in order to guarantee the future be able to use to achieve the best performance.
3. Some automated intelligent rapid charger when the lights change direction, said only 90 percent full. Charger will automatically slow to change with full battery charge will be. After the battery will be full of the best, otherwise they will be used to shorten the time.
4. Charging, lithium batteries do not need special discharge, discharge improper battery will be damaged. When charging as much as possible in order to slow Chong Chongdian to reduce the fast charge mode; time not more than 24 hours. After three to five times the battery fully charge and discharge cycles of its internal chemicals will be all the “activation” to achieve the best results.
5. Please use the original or the reputation of a good brand of chargers, lithium batteries use lithium battery charger dedicated, and follow the instructions that would otherwise damage the pavilion battery or even dangerous.
6. There are a lot of users are often in charge when the phone open, in fact, it will hurt the mobile phone is easy life, because in charge of the process, the cell phone circuit boards will be hot at this time if there are external phone, you may have a moment Current return on cell phones within parts of the damage.
7. The battery life determined by the number of repeated charge-discharge, so to avoid battery power than when the charge, which will shorten the F2299A life. Phone off for more than 7 days, the first mobile phone batteries should be fully discharged, adequate electricity and then use.