Digital battery

Laptops configured power systems, including rechargeable battery and external DC power. Power in a case, the user can use an external power supply current for laptops, in the absence of food outside the office, and can be powered with batteries. Thus, when the Laptop battery is the key to the base of the laptop, users will need extra attention to him.

Tip: If long-term use of external power supply, DC, you can not remove the battery to extend battery life.

Small knowledge: the first launch of the battery nickel-cadmium batteries (NiCd), these batteries have a “memory effect”, each charge is required before the evacuation, very easy to use, and soon found himself nickel-hydride battery metal (NiMH) replaced, NiMH Not only is there no effect “memory” and make more per unit weight of 10% of electricity. The IBM ThinkPad R51 battery most commonly used is lithium-ion battery (Li-Ion), it is also ineffective “memory, compared to NiMH per unit of weight gain more power, the price two times higher than the NiMH . In the same weight, these three types of battery that is 1: 1.2: 1.9.

1. Good battery usage

The phones today are equipped with lithium batteries, but not nickel-cadmium batteries or nickel-metal hydride batteries, as a souvenir, but if you do not or can not be fully discharged the Battery is full of a whole, so every three months on the lithium-ion battery fully charge and discharge approach is very useful. To achieve the fully discharged battery when the Dell Latitude D500 battery remaining 10% must be allowed when the system in standby mode and the prohibition of 3% in hibernation to ensure that the battery fully discharged for actual results . If Windows XP, you can enter the “Control Panel → Power → Warning” label, respectively, click on “Low battery alarm” and “a serious shortage of battery alarm” 2’s “action alert” to delete all options in and then withdrew these two options (Figure), although the shortage of battery power will not be an alert, it will allow the battery run out and eventually shut down all power .

In addition, if the computer is not used for a long period, the lithium batteries will be inactive for 2 to 3 weeks through self-discharge all electricity consumed, so again, it should give before using it to recharge. At this point should be charging the battery for 12 hours straight, and the complete charge and discharge the hp 417066-001 battery three times to completely wake up. If a battery of 12 consecutive hours, or after the third cycle of charge-discharge still can not pay, this means that the battery in May were already gone, usually the battery at about 300 to 400 times (400 — 600 times better special) after loading / unloading capacity of the battery is the equivalent of about 75% of the new battery.

Little Argument: The view above is the official views of the manufacturers written instructions, is naturally supreme notebook users point of view. However, many users have found an interesting phenomenon that so that when the battery is full, after an hour (do not pull the plug), Zaiqu laptop batteries touch, the result is close to room temperature is because the sony VGP-BPS5 battery is not charging and discharging status. In fact, the circuit of the lithium battery protection with the circuit itself, the goal is to avoid overload and low battery. When the battery is full after charging indicator light went out, the battery is not charging into electricity, and you can then plug the power plug to recharge the battery in the face of what? In this regard, it is also a forum to discuss batteries laptop most intense.

2. Precautions

To ensure the laptop battery can maintain a better working condition when in use there are some considerations.

(1) New bought the fully charged battery at least once a power, then the power exhausted, the second only after fully charged formally. This can not fully activate the chemical effects of lithium batteries.

(2) When the laptop using the AC power from the battery when it is best to avoid them, they are responsible. It can be recharged when the best off the laptop, the battery can be fully charged. Also, do not unplug the power load in half-way, and finished 30 minutes after charging before use.

(3) If you use the battery, booting after a few minutes, it is preferable not to take over the external power supply, but to let the battery charge runs out after them.

(4) Sometimes it is connected to AC power from the battery May not charge, because some providers to prevent battery over-charge cycles and deliberately designed to record, and only less than 95% when apple A1022 battery started charging. In the notebook when charging, if the watch does not cut the battery is already full AC power, because the battery power at this time may be near 80%, it is better able maintain an external power supply for about 30 minutes time-out support to ensure a fullycharged battery.

(5) Long term have the battery must be placed in the shade to weaken its internal autonomy, the reaction rate of passivation.

In fact, there is not much to take into account the use of the battery of attention to the number of times a cell can use the difference in more people from the battery itself, differences in the manufacturing process, choose the laptop has a good reputation is no doubt in the future long battery life of these guarantees.

3. To use the software to perform full and free

If your laptop for a while, it can not be filled with the battery or the battery is full can not be used at the scheduled time when you can about the need to fully discharge and recharge the battery to solve the problem. UNI home now includes laptops, including providing the discharge of the CMOS battery and charging capabilities, these operations can refer to a specific user guide to complete the action. Of course, it is necessary to install the software to achieve this functionality, the following update on the procedures with IBM ThinkPad X60 battery as an example of the battery discharge and charge description.

First stage: official homepage Download the updated IBM battery program, if necessary based on their own laptop models to choose the relevant procedures, or they may not be the successful monitoring of action .

Second stage: In Windows, double-click the downloaded file to be, according to the procedures and prompts formatted disk in the floppy disk, press the Enter key to start the production system after the startup disk.

The third stage: In the laptop using the case of an external power supply with this disk to restart the computer, the screen displays the words starting PC-DOS.

Step Four: After the boot into the system, follow the prompts to unplug the external power supply, the program will automatically discharge the battery until the computer automatically closed until the completion of the battery so the discharge operation.

Tip: In the discharge process on the screen there will be a percentage of progress notes, does not see the spectacle of a zero per cent to finish, and the whole process does not remove disk .

Step Five: Wait 10 minutes then the A1045 battery has cooled a good external power supply, the reusing a floppy disk to restart the computer, once the disk in the autoexec.bat file runs automatically update program, and prompts to continue or not. Click “Yes” to return to the DOS prompt, indicating the process of refreshing the battery is full.

Step Six: Turn off the computer, but do not unplug the external power has kept the battery power until the green light.

With this operation can be performed on the laptop battery deep discharge and charge, which can not recharge the battery to allow it to have longer working hours. However, the overall operation requires relatively long time it usually takes 6-8 hours, and this step was repeated three times for best results, so the whole process is tedious. We also remember not to attend the deep cycle BATCL50L battery for laptop or notebook batteries provide a certain extent.

How to make good use of laptop batteries, how to extend the use of time and use of living and so on, is undoubtedly the troubled mind of the majority of laptop users, a problem the use of Laptop battery. There are many methods and techniques, which requires us to use more in peacetime learning and application.

(A) quick access to hibernation temporarily using a laptop to save battery power, you can set the agenda for power management, allowing the system to enter sleep mode after a period of time but it is a shorter or longer will have to wait a few minutes Is there a way to make the system of the laptop immediately enter a state of hibernation? To make the system computer notepad to enter the sleep state of a fast and easy way is to directly close the display. Press the representation would require little effort, you can make notebook computers to standby mode immediately and effectively save power. When you need to reuse the time, as long as the opening screen, the system automatically returns to pre-condition.

(B) the screen saving mode in notebook computers TFT screen is the most important components of power, to reduce its use of the IBM ThinkPad T60 battery when the power consumption, notebook makers have developed plans ingenious, but typically are based on the brightness of the screen below, and is well off-screen mode. In some settings management of laptop power you can customize the brightness of the screen, most laptops with a shortcut keys specific adjust the brightness of the screen, typically 6 to 8-setting brightness level.

(C) to set energy saving desktop using alternating current, most energy saving features for laptops May importance of not being great, but need to use BATCL50L batteries for laptops The use of energy saving features should be taken seriously a. How to design computer hardware more energy efficient, not a user problem to be solved. The user can be installed on the computer of the efficient use of energy saving option. Energy saving settings require the user to set two: First, the computer BIOS setup program on energy saving in the profile settings, the most important thing is that there Energy savings in many settings of the operating system and operations. In the practical implementation of computer systems, Windows systems should outweigh the energy savings settings in the CMOS settings.

1. BIOS settings for energy saving in the CMOS settings, has a great “power savings”, which may choose to “Maximum Battery Life” and “Maximum Performance” and other options. “Maximum Battery Life” is the recording power default setting mode. Computer power saving mode phones in several states such as Idle, Standby (standby) mode Suspend mode suspend (sleep) mode. Laptops, these parameters were able to regulate energy consumption, mainly in computer power saving state, the timely closure of some without the use of system equipment. If the wait state, turn off the screen and hard drive, in hibernation, apart from a rigorous monitoring and the hard drive, but also the memory contents can be saved on the hard drive, basic maintenance system throughout the computer closed, once activated, or restart the computer, Dell Latitude D410 battery office will be refurbished and pre-hibernation state. The energy saving settings in the CMOS, mainly determined by mode waiting to enter standby Timeout, set to enter Suspend mode from standby to suspend time Timeout. Travel BIOS Phoenix is the most common. Energy saving various BIOS settings may be somewhat different, it should carefully read the screen.

2. In the energy saving settings for the average user in the Windows operating system for a better understanding of energy management can be simpler. Windows Help file in the “management hardware and software” entries, there are two laptops equipped with energy-saving elements on “Manage Energy Use” and “use of mobile machinery “in the laptop power management.” Energy saving settings in Windows, read the contents. In the Windows “Control Panel”, “power management click, you can open the” Power Management Properties “dialog box. In the” Power Management Properties “dialog should be” power management “is set to “Laptop” and reasonable settlement “system delay”, “close the Monitors”, “Turn off hard disks” and other options. Another computer can control the opportunity to have some differences, options for the new plant and the latest computer software will be easier to implement, the detailed parameters should be based on characteristics of the computer and Windows files help to complete. In addition, if your laptop integrated infrared port, no time of the ban, you can also extend the life of the laptop hp F4812A battery.

(D) The alarm settings are set battery alarm in time to prompt the user to record information. Is to click on Open “Control Panel”, double-click “Power” option, point “alarm” menu bar, alarm, battery low “column, Windows 98 default is 10%, “a serious shortage of battery alarm” column, Windows 98 default is 3%, which may make appropriate changes as needed. Click the [Alarm Response] button, the warning “voice” and “displays” are selected, the “power level” May of time to select. Alarm limits so that when the sony VGP-BPS5 battery is used, it will display a warning dialog and the buzzer alarm sounds to alert the user to record information about the delay. Finally click [OK] to exit the settings of power management.

(E) opens the energy save function in the “technology of extended laptop battery life ’section, we introduce the energy saving feature is the use of processor technology, which allows play in making the performance of battery life for portable between time to reach the best balance. Most new laptop models in both the BIOS of the processor energy saving technology have given support , is enabled by default, if not open until the Enter the BIOS will support the option to open OK. The use of third party software to monitor the condition of the toshiba PA3399U-2BRS battery only from Windows built-in features power management, there are many utilities available to monitor the battery status. For example, PowerCenter is a power monitoring tool available for free download (http://me MBers.xoom . com / TimothyBug / PowerCenter / index.htm). Only 800kb, is designed for computer software notebook services.

In addition to the amount of PowerCenter shows the percentage of battery, but also to show the actual time and hours of time can be used. PowerCenter total of three display types.

(1) FullDisplay: In the window displays detailed information, including the use of battery or AC power, the percentage of the battery and the remaining time available.

(2) CompactDisplay: in use is always above the window.

(3) MinimizeDisplay: PowerCenter reduced to make the Windows taskbar, the display of information is relatively simple. PowerCenter is also attached to a control center may be composed of six types of warning. When the apple A1175 battery? Up to a certain level, a warning time user, save the file being processed. In order not to waste electricity and CPU resources, PowerCenter to automatically detect the changes of state of the batteries.

(Vii) deliberately turned off the battery ran out of battery on a regular basis to ensure a full charge. If you need to run completely out of the battery in the specific practice is as follows: In the box Power Management dialog, select the battery is empty feeding particular, all 3 of its ongoing options batteries are fixed forever, this laptop on the run to continue. Select mode, then enter the Alerts tab, lift the battery low and critical battery Warning check box is a check mark (yes, when the battery is low, the machine will not go into the suspended state). Then leave the computer running the CPU time of tasks, such as the computer automatically perform a number of computational complexity of the 3D demo program, so running out of Aspire 3000 battery remaining, of course, these disposal N Do not forget to unplug the AC plug.

(8) How to calibrate the battery to the battery to achieve the best performance, certain models of laptop offers a calibration function of the battery, the first use of batteries can be used to calibrate the battery for this feature. Calibration procedures are exhausted supply, then re-filled with electricity, which allow Windows battery gauge to monitor the battery status correctly. Calibrating the battery, follow these steps.

(1) Into the laptop ac adapter.

(2) Restart the laptop, the startup screen appears, press F2 to enter the BIOS program.

(3) In the BIOS program, select Exit point, then select BatteryAuto-Learning option.

(4) Press the Enter key, select BatteryAuto-Learning (which will appear in front of a “√“, “number).

(5) Select Exit SaveandExit Project to save your settings and exit the BIOS.

(6) The system will reboot and start the calibration of the laptop battery.

Laptop use for a period of time longer prone to the problem of declining capacity of the battery, resulting in the battery life of laptop shortened. This is essentially internal batteries or battery failure caused by aging. In severe cases, the use of calibration procedures or Laptop battery charge and discharge are repeated to solve the problem. For this problem, there are many fans who would be the battery case open, find and replace outdated batteries will be able to solve the problem. The current situation is really the case?

Replacement batteries must be cautious

Since the laptop is now a greater use of lithium-ion batteries, while the life of lithium-ion battery is essentially constant, and its battery life of only 500 to 800 times. Therefore, if often use battery-powered laptops, latest, 1 ~ 2 years, the Dell Inspiron E1705 battery is easy to achieve because of the internal life of the batteries fail. As we open the battery when the battery test is represented in one or two batteries damaged. However, due to other cells that is about it, even if you replace the batteries fail, the battery can be quickly returned to normal, will soon fail for other batteries and battery life can be full used again.

Then, all of the laptop battery to replace all the internal capacity to solve the problem? In fact, it’s hard. Because in the original cell, its internal battery is the corresponding exact result if the battery capacity, the terminal voltage and internal resistance of the consistency property. We bought on the market in batteries, and have not been tested and matching, we can not for the amateur conditions, combined batteries, so its capacity, internal resistance and other parameters vary inevitable. In the internal battery, batteries are in series between them after the load (in most notebook battery, is 8 cells were divided into two groups, four in series and then parallel to form a battery pack) due to the hp Pavilion DV1000 battery charging current from which the smaller capacity batteries will be the first total power, but not enough because the other battery, the battery terminal voltage can not create voltage load circuit will continue to charge the battery pack. In this way, the batteries supply the original track will be overloaded. To reduce the charge time, laptop charging circuit load current is very high, so will charge batteries when the tremendous heat, so that the batteries inside the liquid temperature increases, pressure increased, the internal electrolyte easily dry up or overflow, leading to a further decline in cell capacity, there is a swelling or even an explosion. The total capacity of the battery capacity by the decisions that smaller batteries, so that would create a vicious circle, after repeated charge-discharge capacity of the whole battery would be considerably reduced, which leads the ‘Time use laptop.

At the same time, a number of laptop batteries to prevent unauthorized users from opening to replace the batteries, has a microchip and an anti-line off Cape. As the hull of the sony VGP-BPS5 battery or batteries to open circuit the battery removed, intelligent protection circuit will cease production of the battery. Even if we re-cell batteries to take on the whole circuit or the shell of the battery, its smart protection can still be restored. In this way, the battery will not work out. We need to re-reset the smart chip to solve this problem, but a condition amateur can not reset the chip to chip. Therefore, when replacing the batteries may cause permanent damage to the battery.

So how can we solve the battery problem? The best way of course, is to buy a new battery of origin, but now a new original equipment batteries for hundreds or even thousands of dollars, this cost is too high, higher than many consumers can afford. However, there are a number of professional station laptops repair, equipment and technology are good, but there are repair stations and manufacturers of batteries existence of long-term cooperative relations, the toshiba PA3191U-3BRS battery can be made corresponding precision. This would maintain the quality. In these places for the price of batteries is about 300 yuan, though he compares the prices of their own to replace batteries is higher, but keep the battery long-term use. In addition, some service stations are also carried out repairs for six months before the battery warranty. We use these six months, while there are a hundred times or two to ensure the battery charge and discharge, and battery capacity and stability during this period, then after the battery is about to enter a stable period is not easily damaged.

The trick to keep the battery

In all cases, replacement batteries for each of us is not a small price to pay, we must be aware in their daily use to maintain the battery to extend battery life.

To protect the battery, first reduce the number of battery, which means it is electricity to the extent possible not to use the apple M8403 battery. This can reduce the number of loading and unloading of the battery to extend battery life. Although this use to a few drawbacks, but think of you each time you use the battery, it must pay two dollars, be prudent in the summer bar.

The internal structure of the battery

Calibration procedures battery can extend the battery life has been a debated issue. Support of people think that the calibration of the battery eliminates the battery memory effect, extending the battery life. Opponents argued that now use lithium-ion batteries have no memory effect, if the correction procedures will only increase the number of loading and unloading of the battery and shorten the life of battery. In fact, two types of agreement are incomplete. While the reduced lithium-ion battery memory effect, but the memory effect still exists. Calibrating the battery may actually reduce the memory effect, but this is not the most important, the main function of the calibration procedure of the battery is put in place the Aspire 3000 battery and control circuit to optimize the control circuit can correctly identify the capacity of the battery to avoid overcharging or over-rejection phenomenon. At the same time, you can also ensure that the battery is exhausted before the system closed to protect data security. However, frequent use of calibration procedures of the battery would indeed increase the battery charge and discharge time. Therefore, we once every three months or if the calibration procedure of the drums on it.

We use energy from the battery when the laptop or adapter to charge the battery, disconnect the battery cell. Regardless of the battery is charging or discharging state, the current is very important if we try to connect the battery, it is easy to produce electrical sparks, not only will the removal of contact, the impact of current may also cause the board of the battery or system portable charging circuit damage.

In addition, many people there are some misconceptions about the use of the Dell 75UYF battery. Such as “newly purchased batteries need to go through a few charge-discharges to enable,” “laptop battery needs to full output:” In fact, Li-ion battery memory effect with the reduction and improving battery protection circuit internally. These factors have an impact on the battery capacity is very low, and we only run the calibration procedures of battery on a regular basis will be able to eliminate the effect of these transactions on the stack, we must not wait for that, and that more care with your laptop, after all, the battery is to keep using.

For notebook fans, owning a laptop was their dream. But once she had, the problem is more room. Became the priority of routine maintenance, especially for those of us who believe that books for the lives of poor students, it is love, it is good. Be properly protected Laptop battery for future replacement, when the second hand can be a better price. Then let me teach you some tricks routine maintenance, pre-emptive.

1 Notebook Case  

For laptop casings, the emergence of the most brilliant use of time laptop is easier to wear, especially by Sony, Samsung and other Asian brands the most serious. As IBM ThinkPad R52 battery and the emergence of a black, but has experienced “Wutasancu” in your use. However, this does not mean more friends using the Sony or Samsung would announce the death penalty, we can anticipate and prevent many.

Now you can buy on the market for laptops to use clear plastic molds of protection, put on the roof attached to the machine, a thin and transparent, without losing beauty, but also well protected roof was removed ! If you can not buy this film can also be marked with the floor wax on the surface, both beautiful and practical.

However, we have to order by the rest of the wrist, where the laptops, but most likely place Diaoqi with a long wrist wear sweat wet, and then not withstand rugged notebook such as torture, so I recommend that When you capture the laptop Dell Inspiron E1505 battery on watches and other jewelry as far as possible to avoid a hard object scratch laptop wrist rest, and you can be modeled in the machine above looks like Sony, etc. In the over a number of stickers affixed to minimize the damage.

Finally do not forget to choose your laptop for a package of high quality, it can give you the most intimate protective host cell, a well-designed bag laptop will not only be able to meet your needs for loading facilities, but also as the power to provide adequate protection for laptops.

2 computer monitors notebook

Compared to the onset of the maintenance and upkeep of the screen is more important. Not only because the book is more expensive accessories, and / or because the screen will have a direct impact on the use by him comfort. Prolonged use of laptops, screen brightness is dimmed slowly become yellow paper 1. That’s because the screen inside the tube caused by aging is a normal phenomenon. If you want to reduce the rate of yellowing screen laptop hp F2024A battery, you can properly adjust the brightness by about using a laptop, so it can significantly reduce the rate of aging.

Tend to clean the screen often do not die so dirty when the new screen-Rub. Use some of the special fabric of higher quality, such as the eyes of high-grade, cloth, paper lens and so on. Represented a small amount of water or a special washing liquid by gently wipe the opposite direction. Note here that in the dry before turning off the machine, so that fluid flow past the screen the following years led to a short-circuit the gap.

Some of my friends like to develop their own protective film LCD, we do not propose to do, because any protective film reduces the actual LCD display, especially in the clarity and sharpness has become more apparent protective film usually very difficult to obtain recently there are no bubbles, in addition to showing the machine and use the Environment laptop sony VGP-BPS5 battery is very hard, we do not propose to affix LCD protective film.

3, laptop keyboard and mouse

For the keyboard of the laptop, people often complain to the user to use a period after the phenomenon can occur dayou (keycap being polite). This principle does not save as much as half of the keyboard is a keyboard, the number of young people appear dayou phenomenon. If you feel really bad for your keyboard, then you add on the market to buy a laptop keyboard normal instead of using the keyboard or some keys on the commonly used, such as spaces, carriage returns posted a few stickers of Nice, the same as being able to damage minimized. However, I personally think that the laptop is used to use such and such is really no need to waste.

Rising in the mouse, the keyboard is on this thing is relatively well treated. As for the trackpoint much! For a “hat” to “OK”, and it remains to find a replacement, you can also first described the “hat” to take down, possession of a small amount of toothpaste, toothbrush rub gently to dry after you can continue to use. Cautions do not use alcohol, soak, or “hat” above all the hair fall. As users of the touch pad, toshiba PA3465U-1BRS battery make a lot of time to use a lot of dirt in the silt with thin cotton swabs wet cleaning water may be prudent not to sprinkle on top.

4, notebook batteries

a, an appropriate charge and discharge

Not too high or too low, under the current load, especially taboo in the charge voltage instability!

b, to minimize the discharge less than the load or discharge

For comparison, no need for me to say, all rechargeable batteries should avoid it. Often with the laptop battery may be just a short time as the battery remaining 70%, if the switching power supply, the battery is automatically charged, there is no such a cycle, although the life battery is not in the absolute number of cycles set to die but always it will reduce the capacity of batteries, lithium-ion battery is claimed that no memory effect, but in fact a relatively low memory effect Bale. Once I thought of a friend to see the apple A1079 battery because they do not attach any importance to this point, the last laptop battery can not emphasize 5 minutes……

Remember these 2 points, you make battery life longer.

Well, this so that you hesitate, hurries up measures to protect your laptop and let him play one more light and heat for your bar.

For those who have a laptop and showing you care for people who always want their laptops may be superior to the use of longer duration. For laptops are very important Laptop battery, the general can be recharged hundreds of times, so each time loading and unloading can be regarded as a step by step process to die. So how can we slow the process of dying? Firstly, do not confuse the battery and laptop computers. When the battery and the computer to match exactly, but this does not mean that the battery must be the total Pong on the side of the computer. When you bought a new laptop or a new battery, or at least the power of the battery is full and let go after a few months and repeat. The move is intended to reset the state of assessing the number of battery charging circuits, so that it will not be filled when the battery is not ordered to stop charging. Time reset for each circuit, the load capacity of the battery can be increased by a few percentage points. Second, organize your schedule. If you do today will use the battery, then filled in advance. If you do not see it being used, more than half the electricity consumed after the Dell Inspiron 1501 battery of the laptop discharged. (Of course, this means that if a sudden power outage you can not come to a backup battery powered it.) Laptop battery should be maintained in the repository rather than about 40% of capacity, if is fully charged, then the fire risk will increase substantially, however, if the battery completely let go of power, the next may not be recharged in power. To better support the discharge time from January to February. Separate battery and computer store for the simple reason, the computer may have a fever. If the battery temperature rose too high, it will automatically discharge the long term, reduces the battery life laptop to sleep. Therefore, a separate battery is best kept at room temperature stored Jia state. Heard it was suggested that the batteries stored in the refrigerator a little too extreme, not enough to place over very hot. Finally, some cases how the notebook battery powered only by the computer to extend the use of counseling time and suggestions:

1 has spent the laptop, use the Windows operating system, the standby “and” sleep “mode. The computer is in standby mode, the hp 361742-001 battery reserve of up to 50 hours. The computer is in standby mode when the display and hard drive is off, the computer all open files and programs are stored in memory. Once the boot so your computer can quickly restore the original state of work If you are from one room to another room to work the best in the transfer process so that your computer is in standby mode. The computer is in standby mode would be frozen state when you reopen the computer, He will return to your work before shutting down the state. They say that the laptop battery dormant in the waiting time up to 6 months.

2 Turn off your computer, you do not work. Turn off unused equipment such as wireless networking, Bluetooth capabilities, in effect, open the control panel of the computer with power options, you can complete some of their own creation.

3, whenever possible to reduce the brightness of the computer screen LCDs are very common.

4. instead of laptop hp battery from electrical waste to things irrelevant. Do not rely on the case of batteries notebook, draw, listen to music and watch DVDs.