Lundi 23 novembre 2009 1 23 /11 /Nov /2009 07:48
Laptops tend to lose their charm quickly

when you’re constantly looking for the nearest power outlet to charge up. How do you keep your battery Asus A42-A3 Battery going for as long as possible? Here are 15 easy ways to do so.

 

1. Defrag regularly - The faster your hard drive does its work - less demand you are going to put on the hard drive and your battery. Make your hard drive as efficient as possible by defragging it regularly. (but not while it’s on battery of course!) Mac OSX is better built to handle fragmentation so it may not be very applicable for Apple systems.

2. Dim your screen - Most laptops come with the ability to dim your laptop screen. Some even Asus Laptop Battery come with ways to modify CPU and cooling performance. Cut them down to the lowest level you can tolerate to squeeze out some extra battery juice.

3. Cut down on programs running in the background. Itunes, Desktop Search, etc. All these add to the CPU load and cut down battery life. Shut down everything that isn’t crucial when you’re on battery.

4. Cut down external devices - USB devices (including your mouse) & WiFi drain down your laptop battery. Remove or shut them down when not in use. It goes without saying that charging other devices (like your iPod) with your laptop when on battery is a surefire way of quickly Acer BTP-ARJ1 Battery wiping out the charge on your laptop battery.

5. Add more RAM - This will allow you to process more with the memory your laptop has, rather than relying on virtual memory. Virtual memory results in hard drive use, and is much less power efficient. Note that adding more RAM will consume more energy, so this is most applicable if you do need to run memory intensive programs which actually require heavy usage of virtual memory.

 

6. Run off a hard drive rather than CD/DVD - As power consuming as hard drives are, CD and DVD drives are worse. Even having one in the drive can be power consuming. They spin, taking power, even when they?re not actively being used. Wherever possible, try to run on virtual drives using programs likeAcer BTP-AQJ1 Battery Alcohol 120% rather than optical ones.

7. Keep the battery contacts clean: Clean your battery’s metal contacts every couple of months with a cloth moistened with rubbing alcohol. This keeps the transfer of power from your battery more efficient.

8. Take care of your battery - Exercise the Battery. Do not leave a charged battery dormant for long periods of time. Once charged, you should at least use the battery at least once every two to three weeks. Also, do not let a Li-On battery completely discharge. (Discharing is only for older batteries with memory effects)

9. Hibernate not standby - Although placing a laptop in standby mode saves some power and you can instantly resume where you left off, it doesn’t save anywhere as much power as the hibernate function does. Hibernating a PC will actually save your PC’s state as it is, and completely shut itself down.

 

10. Keep operating temperature down - Your laptop operates more efficiently when it’s cooler. Clean out your Acer BTP-APJ1 Battery air vents with a cloth or keyboard cleaner, or refer to some extra tips by LapTopMag.com.

11. Set up and optimize your power options - Go to ‘Power Options’ in your windows control panel and set it up so that power usage is optimized (Select the ‘max battery’ for maximum effect).

12. Don’t multitask - Do one thing at a time when you’re on battery. Rather than working on a Acer Aspire 1300 Battery spreadsheet, letting your email client run in the background and listening to your latest set of MP3’s, set your mind to one thing only. If you don’t you’ll only drain out your batteries before anything gets completed!

13. Go easy on the PC demands - The more you demand from your PC. Passive activities like email and word processing consume much less power than gaming or playing a DVD. If you’ve got a single battery charge - pick your priorities wisely.

14. Get yourself a more efficient laptop - Laptops are getting more and more efficient in nature to the point where some manufacturers are talking about all day long batteries. Picking up a newer more efficient laptop to replace an aging one is usually a quick fix.

15. Prevent the Memory Effect - If you’re using a very old laptop, you’ll want to prevent the ‘memory Acer LCBTP03003 Battery effect’ - Keep the battery healthy by fully charging and then fully discharging it at least once every two to three weeks. Exceptions to the rule are Li-Ion batteries (which most laptops have) which do not suffer from the memory effect.

Bonus Tip #1: Turn off the autosave function. MS-Word’s and Excel’s autosave functions are great but because they keep saving regular intervals, they work your hard driver harder than it may have to. If you plan to do this, you may want to turn it back on as the battery runs low. While it saves battery life in the beginning, you will want to make sure your work is saved when your battery dies.

Bonus Tip #2: Lower the graphics use. You can do this by changing the screen resolution and shutting off fancy graphic drivers. Graphics cards (video cards) use as much or more power today as hard disks - Thanks Andrew

Update 7/7/07: Acer TravelMate 4500 Battery Bonus Tip #1 to give caution about turning off autosave, tip #8 to change information about discharging batteries - thanks to all who pointed it out. Added Bonus tip #2, Tip #1 to add in clause in regards to Mac OSX, Tip #1 about the spinning of hard drives - thanks to all who pointed it outLaptops tend to lose their charm quickly when you’re constantly looking for the nearest power outlet to charge up. How do you keep your battery going for as long as possible? Here are 15 easy ways to do so.

 

1. Defrag regularly - The faster your hard drive does its work - less demand you are going to put on the hard drive and your battery. Make your hard drive as efficient as possible by defragging it regularly. (but not while it’s on battery of course!) Mac OSX is better built to handle fragmentation so it may not be very applicable for Apple systems.

2. Dim your screen - Most laptops come with the ability to dim your laptop screen. Some even come with ways to modify CPU and cooling performance. Cut them down to the lowest level you can tolerate to squeeze out some extra battery juice.

3. Cut down on programs running in the background. Itunes, Desktop Acer Aspire 1410 Battery Search, etc. All these add to the CPU load and cut down battery life. Shut down everything that isn’t crucial when you’re on battery.

4. Cut down external devices - USB devices (including your mouse) & WiFi drain down your laptop battery. Remove or shut them down when not in use. It goes without saying that charging other devices (like your iPod) with your laptop when on battery is a surefire way of quickly wiping out the charge on your laptop battery.

5. Add more RAM - This will allow you to process more with the memory your laptop has, rather than relying on virtual memory. Virtual memory results in hard drive use, and is much less power efficient. Note that adding more RAM will consume more energy, so this is most applicable if you do need to run memory intensive programs which actually require heavy usage of virtual memory.

 

6. Run off a hard drive rather than CD/DVD - As power consuming as hard drives are, CD and DVD drives are worse. Even having one in the drive can be power consuming. They spin, taking power, even when they?re not actively being used. Wherever possible, try to run on virtual drives using programs like Alcohol 120% rather than optical ones.

7. Keep the battery contacts clean: Clean your battery’s metal contacts every couple of months with a cloth moistened with rubbing alcohol. This keeps the transfer of power from your battery more efficient.

8. Take care of your battery - Exercise the Battery. Do not leave a charged battery dormant for long periods of time. Once charged, you should at least use the battery at least once every two to three weeks. Also, do not let a Li-On battery completely discharge. (Discharing is only for older batteries with memory effects)

9. Hibernate not standby - Although placing a laptop in standby mode saves some power and you Acer Aspire 1680 Series Battery can instantly resume where you left off, it doesn’t save anywhere as much power as the hibernate function does. Hibernating a PC will actually save your PC’s state as it is, and completely shut itself down.

 

10. Keep operating temperature down - Your laptop operates more efficiently when it’s cooler. Clean out your air vents with a cloth or keyboard cleaner, or refer to some extra tips by LapTopMag.com.

11. Set up and optimize your power options - Go to ‘Power Options’ in your windows control panel and set it up so that power usage is optimized (Select the ‘max battery’ for maximum effect).

12. Don’t multitask - Do one thing at a time when you’re on battery. Rather than working on a spreadsheet, letting your email client run in the background and listening to your latest set of MP3’s, set your mind to one thing only. If you don’t you’ll only drain out your batteries before anything gets completed!

13. Go easy on the PC demands - The more you demand from your PC. Passive activities like email and word processing consume much less power than gaming or playing a DVD. If you’ve got a single battery charge - pick your priorities wisely.

14. Get yourself a more efficient laptop - Laptops are getting more and more efficient in nature to the point where some manufacturers are talking about all day long batteries. Picking up a newer more efficient laptop to replace an aging one is usually a quick fix.

15. Prevent the Memory Effect - If you’re using a very old laptop, you’ll want to prevent the ‘memory effect’ - Keep the battery healthy by fully charging and then fully discharging it at least once every two to three weeks. Exceptions to the rule are Li-Ion batteries (which most laptops have) which do not suffer from the memory effect.

Bonus Tip #1: Turn off the autosave function. MS-Word’s and Excel’s autosave functions are great but because they keep saving regular intervals, they work your hard driver harder than it may have to. If you plan to do this, you may want to turn it back on as the battery runs low. While it saves battery life in the beginning, you will want to make sure your work is saved when your battery dies.

Bonus Tip #2: Lower the graphics use. You can do this by changing the screen resolution and shutting off fancy graphic drivers. Graphics cards (video cards) use as much or more power today as hard disks - Thanks Andrew

Update 7/7/07: Bonus Tip #1 to give caution about turning off autosave, tip #8 to change information about discharging batteries - thanks to all who pointed it out. Added Bonus tip #2, Tip #1 to add in clause in regards to Mac OSX, Tip #1 about the spinning of hard drives - thanks to all who pointed it out

 

 

 

Par how wonderful laptop battery - Publié dans : acer laptop battery
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Lundi 7 septembre 2009 1 07 /09 /Sep /2009 13:29
The time has come to brief the purchase commercially available laptop hard drive and battery

As a large-capacity hard drive and battery laptop battery data is currently the most common storage devices, their application space as the market changes, has been a wide range of development, especially in smaller 2.5-inch hard drive and battery, with its large capacity, highly portable features, is becoming large-capacity removable storage devices mainstream products. Thus, in China, this notebook should be mounted exclusive accessories retail arena.
At the beginning of this year, when Seagate laptop hard drive and battery, after the influx of the retail market, its updated and more comprehensive product line has been completely disrupted the original notebooks of the procurement rules, and its powerful technical strength notebook hard drive and battery is to make the monotony of the pattern has been completely broken. This is perhaps the real strength of Seagate brings to the market, the greatest significance.

2.5-inch hard drive and batterys of consumers are mainly two categories, one category is the use of mobile hard disk assembly, and the other is a laptop computer users upgrade needs. The former is for all computer users need to increase the storage space to address the large volume of data carried by the best solution, while the latter is a notebook computer capacity can not meet the application must make a choice. However, according to two kinds of different needs, for 2.5-inch hard drive and battery Toshiba PA3250U-1BRS Battery will need to buy a different program, there will be this matter in detail.

Mobile Hard Disk 2.5-inch hard drive and battery option

If we are to carry large volumes of data, such as movie lovers favorite movie files, professional users need to carry large-capacity special specification documents, as well as photography enthusiasts traveling photo (need with dedicated HDD Enclosure), etc., belong to mobile hard disk the most important applications. So for such users, how does choice of 2.5-inch hard drive and battery?

And notebook computer users to upgrade the different assembly when the 2.5-inch mobile hard disk drive should be advised to select power and temperature control and better products. The vast majority of mobile hard disk using a passive cooling, ie the hard disk box is not active cooling devices such as fans, which is necessary to have a very high quality hard drive and battery requirements. Seagate 2.5-inch hard drive and battery with an example, the SOFTSONICTM FDB motor not only has excellent acoustics, but also a very effective control of the hair hot spots. As the largest mobile hard disk heating Toshiba PA3395U-1BRS Battery components, this part of the heat is to measure an important aspect of vendor technical strength.

Mobile hard disk Another important factor is the purchase protection, performance, and notebook computers within the shock, protection measures compared to the protective thin mobile hard disk box a lot, generally only one pad is used to shock, hard disk data can be Protection can only look at the quality of the hard drive and battery. The current hard drive and battery protection device more complex, especially in some major brands of multi-protection technology, is even more dazzling and complex technical parameters is generally difficult for users to understand. Therefore, in the purchase, we still want the big brand-important goals. For the tens of dollars on the price difference, and their own security of your data than is still very worth it.

To Seagate Momentus 4200.2 series of 2.5-inch hard drive and batterys, for example, the use of ramp load device does not work in the state, anchored in the disk outside of its head, making this the hard drive and battery does not engage in the work Toshiba PA3399U-1BRS Battery of the impact of capacity of 900G, than the average hard drive and battery The 800G target much higher. And that such built-in structure, and also head injury due to vibration data on the hard disk platter the possibility of greatly reduced.

For the mobile hard disk as an alternative point is its stability, as well as resistance to outside interference. Although the motherboard to support USB interface are nominal 700mA steady current, but by the power quality and power consumption of the instability in some parts, have a certain degree on the influence into the USB equipment. Therefore, the hard disk for in this unstable environment is the ability to run mobile hard disk in the assembly when the user needs to focus on issues considered.

In many professional media test, the Seagate 2.5-inch hard drive and battery, the largest state in the power consumption - from Rotary work, you can 557mA of current, normal operation, below the standard operating current of 143mA, its stability of the system require more low. Look at the current product development, lower power consumption has become the development Toshiba PA3084U-1BRS Battery direction for many manufacturers, which is more in terms of the mobile hard drive and batterys is a big plus.

Hard disk capacity for mobile users, more in accordance with their actual needs to arrange for the use of effects and does not have a big impact, so here we will no longer go into details.

Upgrade high-capacity notebook computers is very important to

The current notebook computers, the more common configuration is a 30G or 40G hard drive and battery. Now that a lot of notebook users have been completely phased out the desktop, office, entertainment, games to totally rely on notebook computers, so this configuration has been difficult to meet the needs of the user-round.

With a regular notebook computer Toshiba PA3098U-1BRS Battery applications, the common operating system for Windows XP, together with commonly used software, only the space needed to install the software on more than 10G. If we install some games, then a 40G hard drive and battery, there is more than half the space was occupied by the software have a large. And then download some movies, documents, the original space becomes stretched beyond their limits.

For notebook computer users expansion mode, there are two options: First, a is to buy a bigger hard drive and battery, replace the hard disk first wife. Another way is to buy a relatively small hard drive and battery to move the hard disk in the form of the total capacity of notebook computers to upgrade.

In comparison, for notebook users, the latter program is clearly cost-effective is not high. First, the mobile hard disk transfer speed is far less built-in hard drive and battery, even using the USB2.0 interface, the basic performance with the built-in hard drive and battery also has a big gap, which will for the future use causes lot of inconvenience. In addition, the notebook computer as a mobile data processing center, its portability is its essential features. If you must bring to the mobile data storage hard disk, then the portable will be greatly reduced.

Now that we have identified the best laptops to upgrade the program, then choose what kind of a 2.5-inch hard drive and battery Toshiba PA3331U-1BRS Battery better? Of course, we first look at the capacity. According to the current mainstream desktop configuration and use of our experience, if your laptop first wife has been a marked lack of 40G hard disk, then the 80G and greater capacity should be the best choice for notebook users.

Notebook hard drive and battery upgrades with the purchase of another factor is speed, but speed also means the data transfer speed and heat, the higher the speed, the higher the transmission speed. From the current perspective of the development of performance notebooks, notebook hard drive and battery performance has been playing an important bottleneck. But with the rapid development of technology, the current performance of notebook hard drive and batterys are approaching the level of desktop drives.

At present, many mainstream or high-end notebook has high-speed (5400rpm) hard drive and battery upgrade for users who choose more high-speed hard drive and battery, not only can increase capacity, but also can simultaneously improve the overall performance of notebook computers. The current mainstream notebook hard drive and battery has been upgraded to a 5400 switch, and the low-speed, 4,200 rpm, compared with the price difference is only tens of dollars, its price is very Toshiba PA3166U-1BRS Battery prominent. It is worth mentioning is that many of the hard disk manufacturers have begun 7200 2.5-inch hard drive and battery research and development, industry, the notebook's performance will truly synchronized with the desktop machine.

Par how wonderful laptop battery - Publié dans : toshiab laptop battery
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Lundi 7 septembre 2009 1 07 /09 /Sep /2009 13:26
Nokia original batteries also have the risk of explosion

I was in February 2007 Shijiazhuang fancies from a more formal way a Nokia store Toshiba PA3591U-1BRS Battery (name to see the invoice) bought a Nokia 3250 mobile phone (including cell phone chargers box full set of original CD-ROM products).

Use has been normal, only the Nokia service center once software upgrade (probably around April 2007, listening to my colleagues said a new version of system software upgrade is not easy after the crash, so go up a level)

My phone use than a larger, sometimes only enough power to go to work at the desk when you open machine charging, and sometimes also charging the phone Toshiba PA3506U-1BRS Battery (because the instructions did not allow Nokia to do so)

In September 2008 of the day, I charge according to the past, Which will lead to a sudden there is a call, the phone was found in the cell phone especially hot, and smelt paste taste. Unplug the charger quickly open the phone and remove the battery, then the battery has been found to bulge and crack.

September 28 at the mission on the road to the Nokia free phone 400,800,123 calls, the operator said that Nokia battery warranty period is only six months. That is interested in the so-called warranty do not care about user safety and product quality Toshiba PA3291U-1BRS Battery of the practice of let me loyal Nokia users with no choice.

If there were no calls, I may not be timely detection of the battery pack of drum, which the consequences would be disastrous. If it were to continue to charge it will explode, will it hurt me. Since then every time I use my Nokia 3250 mobile phone battery when I thought I might be hot or explosion, give me the psychological shadow of fear left.
Nokia manual, and does not indicate "battery would bump up security, cracking, burns, explosions," and so on. Therefore strongly recommended that Nokia mobile phones in the show come from the instructions in the mark "to continue to use after the battery out of insurance may be drum package, cracking, burns, explosions or other dangerous"

Want to use Nokia mobile phone friends, then be careful when making a call the battery Toshiba PA3356U-1BRS Battery exploded disfigurement!

Par how wonderful laptop battery - Publié dans : toshiab laptop battery
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Samedi 5 septembre 2009 6 05 /09 /Sep /2009 11:21
Apple admitted that some laptop batteries are charging fault

Up to now, MacBook users have reported more than cell expansion events, the problem is mainly due to 17-inch MacBookPro ... ...

Li-ion battery Toshiba Satellite A75 Battery for iPod suspected quality problems caused by "explosive door" crisis is not resolved, but also cropped up more than laptop battery expansion events; just released to solve the problem battery performance software upgrade program, then there is the design flaw traced to notebooks. Apple continued turmoil in recent days, the flagship product ipod and laptop computer battery quality and widely questioned. This, industry sources told "Daily Economic News" interview analysis, a short time a series of similar quality problems, will likely lead consumers to a crisis of confidence on the Apple brand.

April 27, Apple has publicly admitted some of its MacBook and MacBookPro laptop battery charge failure may exist, and issued an upgrade program to improve battery Toshiba Satellite A70 Battery performance. Although Apple did emphasize the laptop battery charge arising from failure, "there is no security risk, users can continue using their batteries", but according to British media reports, MacBook battery issue is much more openness Apple more serious.

It is understood that, as of now, MacBook users have reported more than cell expansion events, the problem is mainly due to 17-inch MacBookPro. According to one of being a system administrator user is introduced to his research lab where an order for four 17-inch, using CoreDuo processors MacBookPro, of which three units have emerged in the course of deformation of the battery swelling. He said, MacBookPro expansion precursor of the battery occurred, MacBookPro, when using the battery-powered Toshiba Satellite A100 Battery random shutdown, but by the expansion of the battery pressure, sometimes manifested as reduced sensitivity trackpad.

MacBookPro battery due to expansion of the incident took place in foreign countries, so there are problems of a specific product model is currently unknown. The source told reporters that such a battery can be replaced free of charge, but there are potential hazards such as heat explosion, and noted that this problem is the software fixes can not be solved. In response, Apple's head of public relations while China maintains that, Apple has confirmed that there is no battery failure and security risks, consumers can continue to use, and said the battery maintenance plan is not equivalent to the previous battery Toshiba Satellite A10 Battery recall program.

The source said that in today's digital player market, Apple's share of the market share, whether Samsung, Sony, or innovation, Microsoft, can not hold a candle to. Prior to rivals also did not pose a serious challenge to Apple. But the iPod "blast door" after the incident, another series of laptop batteries burst expansion, design flaws and other issues, Apple's product quality will inevitably suffer some of the wavering of suspected users, and even Apple's brand loyal "fans" will also be right already have doubts about product quality. Coupled with respect is not yet on Apple's iPod "explosion" problem and notebook design flaw open to respond to, nor taken any substantive initiatives. Apple brand that consumers trust crisis, "may be only a matter Toshiba Portege 4000 Battery of time only."

Par how wonderful laptop battery - Publié dans : apple laptop battery
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Samedi 5 septembre 2009 6 05 /09 /Sep /2009 11:20
Buy the best laptop to detect the battery half of those in sham

Dealers see the scene clearly break the seal machines, laptops Toshiba Satellite A65 Battery discovered after the results back to the battery charge is not into power, looking for distributors for a battery, problems remain, to the authoritative department detected a battery is a fake. Yesterday (3) days, the public is very depressed Mr Tsang told reporters that he did not know which part of an error, so that my original camera battery into "Li Gui."

In March of this year, Mr Tsang in Nanjing, a computer store to help the company purchased five sets brand laptops. To buy back later, another four camera was sent to the overseas branch offices. However, not long after, Mr Tsang on the Nanjing with this laptop on the emergence of strange things, the battery charge just 10 minutes, power indicator lights on the display is full of power, but connected to the battery, with less than 5 minutes, the camera automatically shut down because of no electricity, and Mr Tsang to determine the battery Toshiba Satellite A60-662 Battery is definitely a problem.

March 23, Mr Tsang was to find store counter, his face told the salesperson, the person himself, after a try, give Mr Tsang replaced a new battery, but returned after the two electric charge, this piece of the battery symptoms identical to the previous one.

Changed how usual it is also a problem? Mr. Tsang at this time cast doubts on the quality of the battery. March 25, John came to the brand battery designated testing organization, after the staff testing, confirmed that the battery is counterfeit products.

Dealer or soft sum of damages,
。 The dealers argued that he had never before moving packaging. Mr Tsang prepared on the matter when the complaints to the business sector, this dealer Huang Leshen, she immediately pulled to the side of Mr Tsang said that to "compounding." Mr. Xiang Zeng promised that she Toshiba Satellite 1900 Battery could give Mr Tsang replacement of the laptop battery, and do not need to test the premise of the report can also be another four camera battery replacement, and can be committed to this legislation to the writings of the battery is true. In order to compensate for the loss of Mr Tsang, dealers also willing to 2,000 yuan as compensation for mental damages.

The face of dealers "sincerity", Mr Tsang would also like to leave it alone, but he was somewhat puzzled, because it was obvious to see 5 sets his camera boxes are packaged good, but the battery was sealed packaging Yanyanshishi, What is the time the battery to , and I am still do not know. However, Mr Tsang said he hoped a good reporter to help him look into it.

Half of the professional inspection are false

Because the appearance is not easy to Toshiba Tecra 9100 Battery distinguish them, using relatively normal, so a lot of black-hearted merchants have been fighting the idea of fake mobile phone batteries. They use these fake batteries to back replace original battery, and then sell the original battery, you can make considerable profits.

"Basically, here detected more than half of all fake mobile phone batteries." A brand camera test center staff told reporters, laptop battery is indeed most likely to be "Diaobao" brand batteries and the general spread of counterfeit batteries to more than seven eight times, and some even higher. Brand manufacturers have also been fake, but the market is so huge inevitably "slip through the net."

One has done digital product owner, Wang told reporters, "Now the laptop market prices closer to costs, some vendors," Tsutsumiuchi loss Diwai fill "in the Toshiba Tecra 9000 Battery accessories on the relentless" slaughter "consumers, while some even direct for one of the parts. "For example, he said that with the Canon camera, for example, an ordinary genuine battery cost will be around 300 dollars, while the counterfeit Canon batteries need only tens of dollars, if the" Diaobao "successful, then earning more than selling more than a laptop.

Buy the best laptop to detect

"Counterfeit digital products accessories has been the focus of our efforts to combat the same time, the complaints in this area are indeed a lot." Nanjing industrial and commercial departments have told reporters that the price of digital products are now more Toshiba Tecra 8100 Battery and more transparent, a camera on the Internet can be quote found, compared to purchase price, usually a difference of no more than 50, a laptop to reduce machine profits has led some businesses to take the risk, so that consumers must learn to distinguish a certain knowledge.

"In general it will not matter a laptop, the problem is most camera with battery." The source said that the camera accessories businesses the means to make a big fuss on the variety, now sold on the market of laptops, batteries are manufacturing plants for the production of original equipment batteries. And an original laptop batteries are generally priced at 200 yuan to 300 yuan, the price is only tens of dollars on fake to 100 yuan. Although in the short-term use, and there is no significant difference, but the fake battery Toshiba Tecra 8000 Battery standby time significantly shorter than the original battery, and charge a very low life expectancy. How to avoid buying fake batteries, the person said, you can buy the camera when the monitoring point directly to the official, "verify its validity," Under normal circumstances professionals with the naked eye can distinguish

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