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Info : How to buy batteries replacement
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How to buy a laptop battery
When purchasing a battery for your notebook computer, the first thing a consumer should look for is the reputability of the product at mind. If the product is made by the manufacturer of your laptop (i.e. Sony, Compaq, Dell, etc), you can usually be sure it is a quality product. However, many manufactures do not actually manufacturer, instead they are the brander of the product. For example, if you open up a genuine Sony laptop battery, you may find that the power cells inside are actually made by Toshiba, Panasonic, or a similar big name company. Sony in this case has just made the plastic case of the battery. this goes to show that the brand of the battery you are buying does not necessarily mean that the quality is superior. Many third party brands use the exact same power cells as original manufacturers. Using a third party manufacturer is often a good way to go when buying a battery, as there are usually many extra benefits. For instance, most third party batteries are much lower in price than original manufacturers? Batteries. Secondly, they usually offer a superior warranty, as they realize that in order to win the consumer's confidence; they must stand behind their product. A 1-Year Waranty is a must. Don? buy any battery with a warranty less than one year. Batteries have been known to die early, and a 3-Month Waranty could leave you high and dry.
The next main thing a consumer should look for is the type of battery. Batteries can be made using several chemicals. For laptops, there are four main types. They are Ni-Cad, Ni-MH, Li-Ion, and Li-Poly. There is no major manufacturer that still makes Ni-Cad laptop batteries, as they are a very old and primitive type of power. Ni-MH is newer and more advanced, but is not as good as its Li-Ion and Li-Poly counterparts. If we compare the last three types (Ni-MH, Li-Ion, Li-Poly), we find that Ni-MH batteries weigh more than the other two, but produce less current than the other two. Li-Ion and Li-Poly are the most advanced types of batteries on the market, and you should try to get one of these two types if possible. Most laptops that come with one type of battery can not use any other type of battery, meaning that if your laptop came with a Ni-Cad, it must be replaced by another Ni-Cad. The same goes for the other types. Please note that in some cases, this does not apply. Some laptops that come with a Ni-MH battery can be replaced with a stronger Li-Ion one.
Lastly you must look at the power rating of the item you?e buying. As technology advances, so do power ratings. The battery you bought last year may be twice as strong this year, and might even be the same physical size. Batteries have two main ratings on them: Volts and Amperes. Because laptop batteries do not carry a very large amount of power when compared to larger batteries such as car batteries, most companies show their ratings with Volts and Milliamperes. One thousand Milliamperes equals 1 Ampere. When buying a battery, always go for the battery with the most Milliamperes (or mAh). Batteries are also rated by Watt-Hours, perhaps the simplest rating of all. This is found by multiplying the Volts and the Amperes together. We will now show you an example of finding the Watt-Hours for our example battery.
Our example battery is 14.4 Volts, 3600mAh
(remember that 3600mAh is equal to 3.6 Amperes).
14.4 x 3.6 = 51.84
this battery has 51.84 Watt-Hours. The term Watt Hour signifies the energy needed to power one watt for one hour. Thus this battery can power 51.84 watts for one hour. Suppose your laptop runs at 25.92 watts (this may be unlikely, but let? use this just for simplicity). This battery could power your laptop for 2 hours. People usually associate the word ? atts? With light bulbs, and yes, this battery could power a 40 watt light bulb for about an hour and 18 minutes, a 60 watt light bulb for about 52 minutes, or a 100 watt light bulb for 31 minutes; it? the same idea.
the reason we have shown you watt-hours is because oftentimes the volts and Amperes vary. For example our laptop that uses a Li-Ion 14.4 Volt, 3600mAh battery may use a NI-MH battery that is 9.6 Volts, 4000mAh. Now let? do the math and find out which battery is stronger.
Li-Ion: 14.4 Volts x 3.6 Amperes = 51.84 Watt Hours
Ni-MH: 9.6 Volts x 4 Amperes = 38.4 Watt Hours
the Li-Ion is stronger.
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ENVY by HP
The power you crave meets the sophistication you desire. Introducing the HP ENVY.Precision crafted with exquisite metal etching, it has everything you ever wanted in an ultra-slim notebook. Powerful processing speeds, instant boot-ups and access to the web, supersonic surround sound and crystal clarity viewing. Who says you can’t have beauty and brawn at the same time?
While its 3D technology will bring a new dimension in the experience of watching that show on 17.3-inch wide screen it looked alive.
Notebook upper class has a size of the hard drive is a great relief, namely, 2 terabytes. So users can freely store digital entertainment collection of high definition (HD) of their favorites.
HP Envy 17 3D belong to the ranks of a reinforced premium notebook series based on Intel’s Core i7 processors with Intel Turbo Boost Technology with the support of the memory 8, and the graphics card ATI Radeon HD 5850 1 GB.
SPEC:
Operating system installed Genuine Windows® 7 Home Premium 64-bit Processor Intel® Core™ i7-720QM Processor
• 1.60 GHzMaximum memory Supports up to 8 GB DDR3 memory Internal drives 2 x 1 TB SATA Hard Disk Drive 5200 rpm Display size (diagonal) 43.9 cm (17.3") diagonal Full High-Definition HP Ultra BrightView Infinity Display Graphics ATI Mobility Radeon™ HD 5850 Graphics with 1 GB dedicated GDDR5 Product weight 3.41 kg 
price RM$ 6,999
Review HP MINI 2140
Review
HP Mini 2140
It also ditches Vista in favor of the more suitable XP Home and adds a larger screen to the mix. Altogether, this makes it a much more interesting netbook than its predecessor.
Design and Build
With an all-aluminum casing and a highly usable keyboard (92% of full size) HP’s Mini netbooks have been considered a premium alternative, although it's a bit heavier than the average netbook.
Thanks to the large keyboard, the trackpad buttons have been placed on either side of the trackpad instead of below it, which may take some time getting used to. The Mini 2140 feels very solid and durable in its metal casing, but the metal construction does add slightly to the weight – the 2140 weighs in at roughly 3 pounds.
Performance and Features
What made the previous 2133 iteration much less desirable than the competition was partly the choice of VIA CPUs, which are somewhat slower than the Intel Atom, but most of all it was the disastrous decision to sell the netbook with Windows Vista instead of a more lightweight Linux or XP. Due to Vista’s steep hardware requirements and the low-end hardware in the Mini, it felt very slow and dated. Even worse was that Vista actually inflated the cost of the 2133.
All of these issues have been remedied in this the new 10-inch Mini 2140. It’s faster and costs less while retaining the same excellent build quality. Vista has been replaced by an old fashioned but snappier Windows XP. In terms of performance, the 2140 can be compared with other similar netbooks – it’s enough for web browsing, office work and watching videos, which is more or less what netbooks are intended for.
The Mini 2140 has the usual ports plus one – in addition to the 2 USB, Ethernet, line-in/out, VGA, and a memory card reader it also comes with an Express Card slot. This might not be important for most consumers, but adds some versatility for professional users who may use it for 3G modems and other peripherals. Battery life was good with the 6-cell battery, almost 7 hours, which is below the specified 8 hours and 30 minutes but still acceptable.
Conclusion
On the whole, the 2140 is a big step up from the 2133 with no price premium – in other words it offers a lot of value while being one of the best netbooks currently on the market. Highly recommended.
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