2012年1月19日星期四

7690 exposed Lenovo Y470p depth profiling of single display of arrogance

7,690 exposed Lenovo Y470p depth profiling of single display of arrogance.
Portable channel on January 13, some people say that life is a spiritual practice, for Lenovo small y as well. Although has been recognized by the majority of users, but never gave up on their own to promote. Since its inception Y470, on-board is n-card, and in 2011 will be back in time, silence has long been the small y punch again, first launched AMD carried 7,000 series video cards Y470p.

At present, which carry the Association Y470p-ISE had AMD Radeon HD 7690M video card arrived in scolded baidu loaded Editorial Department, will bring you right away is that this machine is the depth of the evaluation. In addition to carrying the latest AMD discrete graphics card with Lenovo Y470p-ISE also carry the upgraded version of the quad-core Intel Core I7 2670QM processors, this high distribution of Y470p what what about performance? Immediately be tested links.

In addition to carrying the latest AMD discrete graphics card with Lenovo Y470p-ISE also carry the upgraded version of the quad-core Intel Core I7 2670QM processors, this high distribution of Y470p what what about performance? Go on test link. Lenovo Y470p a design inspired by the information explosion era of cloud computing and digital matrix, a symbol of powerful computing capacity, color schemes and continued the classic black, Orange bound style, energetic yet stable and decent. After special processing of a surface compression not only wear-resistant, and easily contaminated fingerprints, very good cleaning up.



B side of the border of the screen with black engineering plastic material, supplemented with piano baking varnish technology to build, and its top is equipped with a 2 million mega pixel camera. C metal material surface Panel, underscores not only the small y material to be used in full, and secondary notebook internal cooling. Lenovo's ultrathin Y470p-ISE used a 14-inch 16:9 colorful, sharp saturated colours, maximum resolution of 1366x768. Associative Y470p-ISE associative original "high touch keyboard", based on a traditional Island style keyboard, polished in every key risk lamination hands with radians, feel more comfortable. Lenovo's high tactile keyboards of an average laptop keyboard keys-lane long, coupled with the right feedback, enter let each letter are clean.

Lenovo JBL Y470p-ISE continued the internal speaker, with the SRS certified sound, sound quality is very impressive. C top left is a great sense of science and technology of the power button, next to a key recovery keys, then there is one next to the hard drive status indicator, but 5 touch buttons and right above it, like only when power will be lit. Lenovo Y470p-ISE touch version though cannot be described with a spacious, but it is extremely easy. Touch the surface with non-slip design, full of point-like particles. Left and right buttons are very comfortable, and almost no "noise". There are four commonly used indicator below the touchpad.

Chapter summary: through the appearance of the show, we can see the Lenovo Y470p-ISE material is enough, and the work is very solid, compared to some extreme notebook to spread price/performance, and even more expensive is acceptable.

After the actual measured, its opening angle of up to 140 degrees. In addition, hinge opening angle of the Y470p-ISE very good damping control, closing at any angle of the screen can be firmly fixed. As a mainstream dimensions and thickness of mainstream notebook, Lenovo Y470p-ISE interface is also consistent with the mainstream standard, the fuselage is equipped with 3 USB and 1 eSATA interface 2 interface, video output are also equipped with a 1-popular VGA and HDMI interfaces.

Hardware configurations, Lenovo Y470p-ISE using the upgrade version of Intel's second generation intelligent core i7-2670QM processor, matching 4GB RAM and graphics of AMD Radeon HD 7690M on a 2GB a video card performance well. Next, we first look at the Lenovo Y470p-ISE performance. Lenovo Y470p-ISE Intel's second generation intelligent core i7-2670Q0M processor, Quad-eight threads, 6MB three-level cache, at 2.2GHz, support band 2 Duo technology, maximum speed up to 3.1GHz. Meet the HM65 chipset, can lead to good performance. Frequency Duo processor clock speed can be adjusted according to intelligent use requirements, help reduce power consumption and extending battery life better. In addition, spectrum 2 also supports the Duo CPU core of kaderui-frequency acceleration built-in, shared system memory core graphics play a stronger performance.

3DMark 06 tests, scoring breaking 1024x768 resolution, at 10,011. Judging from test results and known memory specification AMD Radeon HD 7690M belongs to the consumption level of high-end video cards, although the discrete graphics performance than using GDDR5 video memory, but it goes far beyond the previous generation of GDDR3 graphics memory discrete graphics. Lenovo Y470p-ISE has two memory slots on the motherboard, up to 8GB of memory. If upgrading to dual channel 8GB memory, memory read and write speeds are expected to 50% to upgrade, reach about 15000MB/s, performance will be more robust.

This chapter summary: in performance tests, we can see the processor and memory performance comparison of associative Y470p-ISE is manifest, and memory performance to upgrade space. AMD Radeon HD 7690M video card properties of concern goes beyond the old generation of mainstream consumer 6000M series video card performance and quality to very smooth running all large 3D game, gaming performance strong.
Endurance test, LENOVO Laptop Battery.
Associative Y470p-ISE is a 6-cell lithium-ion battery, battery 5800mAh, larger battery capacity, for a a power consumption of core I7 laptop unattended, barely adequate.
MobilMark 2007 time measured for 268 minutes (4 hours, 28 minutes), the results for a strong performance notebook, unexpectedly was gratifying.
Chapter summary: after testing, has been troubled by small heat sink of y user problems have largely been solved, and up to 4.5 hours of battery life for a high-performance games already said is quite excellent.
Evaluation summary: Lenovo Y470p continued the Y470N design, maintaining a streamlined sports car design and technology of the digital matrix to remove video card manually toggle switch. Materials is still elegant, works remain solid, even if the price is also very small expensive purchase. Performance, Lenovo Y470p-ISE carried eight threads of quad-core i7-2670QM processor, band 2 Duo technology not only to the processor speed to 3.1GHz, as well as support to accelerate the CPU core of built-in video card, the shared system memory core graphics play a stronger performance. Video cards, carrying the AMD Radeon HD 7690M video card, with 2GB DDR3 video memory than 6000M series video cards has risen, to very smooth running all large 3D game. Overall, this is more suitable for high performance requirements of your laptop user.

2012年1月18日星期三

The Sony SA28 measured i7 Business! 2011 not to leave regret

The Sony SA28 measured i7 Business! 2011 not to leave regret.

Back in July of this year, Sony has launched a equipped with Intel Core i7-2620M processor, standard AMD HD6630M discrete graphics, up to 8GB of memory and 256GB SSD S-Series new VAIO SA28, chocolate fashion look really impressive. Previously, we did not Sony VAIO SA28 new models related evaluation, coupled with Sony's official website has been on sale for VAIO SA4 series of new products in the hardware configuration, mainly the processor i7-2620M (clocked at 2.7GHz) up to i7-2640M (clocked at 2.8GHz), so either from the left in 2011 to make up for the regret of view, or to the Department in advance of the new Sony SA4 predict ahead of another, are a good choice. Well, let us together take a look at the Sony VAIO SA28 Figure reward quick assessment it!
Sony VAIO SA28 aluminum-magnesium alloy casing with black fashion, fashion to increase business, but also conducive to the whole heat. Hexagonal design user-friendly retractable side of the computer package, to avoid the edge of the buckle.

In addition to the bottom of the fuselage, the fuselage rear window of the additional intention to help heat the whole heat. Edge of the edge design is simple and in line with business simple fashion. B-side frame body and the C surface gold appearance, with dark side A highlight chocolate fashion. Meanwhile, the machine together with the 13.3-inch backlit LCD display, resolution up to 1600x900, support for 720p HD playback. Display above the built-in 1.3 megapixel camera, users can enjoy smooth video conversation. Dual graphics mode, to meet the highest performance while the user can save the maximum power. Chocolate with a keyboard, which will help the user in the future the daily clean-up. Meanwhile, the backlit keyboard can be a good support for users in low light conditions to continue. Fingerprint identification, very professional Oh! sony laptop battery.

Blu-ray equipment, for business to provide sufficient support for the entertainment experience.
Built-in USB3.0, VGA, and HDMI interface, such as mainstream, the mainstream entertainment to meet user needs. The bottom of the design simple, and equipped with thermal windows. Equipped with a SIM card slot, freer life is interconnected. New VAIO S Series features a unique "side of hexagonal shell" design, inspired by the closed shell, very enjoyable at the same time so that the body is more vigorous and effective. Designed to facilitate the formation of the body or out into the package. VAIO S series with integrated aluminum keyboard panel and palm rest. Very strict sense of your words, I went a little bit not read Sony's official, but the check is no such machine, then find the SA4 series. Sony VAIO S Series (SA28) out into user-friendly because of its flat body design, and not you mean "edge edge design," and I personally think that the "marginal edge design," so the word is very rigorous, the official description of "hexagonal shell side" is the word derives from Sony, editing may wish to use the word and the word to describe the meaning of the user.

4GB of memory standard, expandable up to 8GB, the application for the program to provide sufficient assurance space. SSDs use, more suitable for business users demand for efficiency. Aircraft equipped with Intel SNB Core i7-2620M processor, clocked at 2.7GHz, Core frequency to be 3.4GHz, performance, very good!
Win7 experience index, a relatively short memory and the graphics board, but the AMD HD6630M performance enough business people to use, and the total score has been very good. GPU tests, we can see that the machine comes standard AMD HD6630M graphics card, memory 1GB, and support two graphics. Sony laptop replacement battery.

2012年1月13日星期五

Thin skinny HP Folio exceeded this exclusive evaluation

Thin skinny HP Folio exceeded this exclusive evaluation.

Up to the end, rolled out major brands carry generation ultra for Intel Sandy Bridge processor platform. Helped by Intel, thin and light design business this product can be said to be sprouted. Admittedly, while Sandy Bridge platform carried Super pole of this genus Ultrabook prototype stage, but with its Super portable power, long lasting battery life and fashion design have won many users of all ages. HP laptop battery.

As Hewlett-Packard's first Ultrabook concept design for ultra thin and light notebook, HP Folio can be said that aspect a lot. In order to balance performance and portability, the products you have selected the Intel Core ultra-low voltage i5-2467M match programme of Intel HM65 chipset. 13-inch screen size, the thickest point of the fuselage just 18mm,128GB solid state drives mix in order to improve the user experience through Dolby sound effects that product certification, while stressing the ultraportable will also take into account the user's experience in multimedia applications.

Mimic Apple with many Super products, HP Folio 13-1015TU notebook very good retention of HP's business model design of this classic-style, including size, weight, just move closer to a super product. Not only does this interpretation of the brand's personality, but also to the super market provides a choice of Westerns.

Just from the design of the die, Folio mini version of 13-1015TU is more like ProBook series, Hale lavish designs showed a strong atmosphere of business. Silver top cover extensive use of Anodic aluminum oxide materials, and the bottom of the fuselage is to select the engineering plastics design, prevents surface abrasion during use, the shell years such as new and better heat dissipation. Both in size and in the overall work compared to previous ProBook series even more delicate.

In screen area, the Folio 13-1015TU uses a 13.3-inch mirror screen designs, and keep a classic 16:9 the display. Design of ultra narrow border while the more eye-catching visual effect, but only the border of the screen is more precise, they truly do not increase the display area. In practice users will find the display area of the screen with black border edge side of the screen there is a clear, it is also used for the first time users need to get used to it.

In order to ensure business positioning, Folio 13-1015TU your laptop's built-in Web camera above the screen, with keyboard microphone on the left, in addition to satisfy simple video recording needs, you can also combine online communications and video conferencing needs. On the design of the keyboard, Folio 13-1015TU uses the popular island of full-size backlit keyboard. May be subject to size restrictions, Folio 13-1015TU cancel HP QuickWeb and Wi-Fi shortcuts for business on this common design. Between the keyboard and screen, design of the product uses a sinking hinges, hinge's central location is also where the Sound. To provide a better multimedia experience effects, Folio 13-1015TU sound effects special Du Biyin-activity-certified.

Compared with traditional business this 13.3-inch, the Folio 13-1015TU slightly cut on interface design. Provides 1 USB 2, 1-USB3.0,1-HDMI interface, 1 x RJ45 network cable interface, 1-in-one card reader and 1 headset/Mike two jacks, so designing in current mainstream ultra this is rare. HP laptop battery.

Compared with traditional business this 13.3-inch, the Folio 13-1015TU slightly cut on interface design. Provides 1 USB 2, 1-USB3.0,1-HDMI interface, 1 x RJ45 network cable interface, 1-in-one card reader and 1 headset/Mike two jacks, so designing in current mainstream ultra this is rare.

In screen tests, we found that HP Folio 13-1015TU brightness is more prominent, 222cd/square meters of maximum brightness for a stressed portable product is also acceptable. Measured in the game session, HP Folio 13-1015TU built-in Intel HD3000 graphics can only meet the needs of entry-level 3D games. For high loads of games like lost planet, which is very exhausting. So we can determine the current nuclear specification Ultrabook notebook is more explicit in the daily Office, and multimedia graphics performance requirements, such as entertainment is not demanding environments.

Advantages:

1, thin and portable, 1.5kg net weight can indeed be said at present 13 inch business the lightest products;

2, the function is balanced, Intel Core i5 2467M processors 4GB RAM together with the 128GB SSD solid state drives enable the platform to handle daily office productivity relishes;

3, strong life capacity, HP battery life of approximately 9 hours UltraBook products we have tested so far are rare;

4, better application experience, backlit keyboard, full extension interface design make the product suitable for all kinds of mobile application environment;

Disadvantages:

1, hardware encryption user matching scheme, with low version does not provide fingerprint encryption design;
2, poor comfort when used on the legs, the bottom of the fuselage near the outlet area of relatively high calorific value;

2012年1月12日星期四

13-inch thin and light business pioneer Dell Vostro V131 evaluation

13-inch thin and light business pioneer Dell Vostro V131 evaluation.


Dell VOSTRO series laptops primarily for small and medium business users, its product lines cover a wide range, we in the test's notebooks VOSTRO series V131 for mobile users. It has about 2.2CM, weighed about 1.8KG,13 inch Compact easily into a Briefcase, suitable for business people with higher demands on notebook portability.


Dell V131 not only has small, portable form factor, while carrying second generation core processor, with a variety of configuration options for us, to meet the needs of different users. We tested V131 carry Intel Core Duo processor 5 GB is currently V131 higher positioning products.


In addition to configuring powerful processor, this test V131 also picked a 750GB of 7,200 RPM hard drive capacity, can provide us with ample data storage space while 4GB memory combined with the HD3000 core graphics, although there are still some gaps to mainstream discrete graphics, but can cope with low load 3D game, a piece of the mainstream level of configuration.


As a business notebook, Dell V131 not only has excellent hardware configuration, at the same time it also comes pre-loaded with a genuine match Windows 7 operating system, does not contain any unauthorized program that will not leave because of tampering and cracked a number of system vulnerabilities, to better protect sensitive data and confidential business information. While Microsoft automatic updates, free downloads, performance upgrades, in ever-changing network environment, you can let the operating system is always in good condition.


As positioning notebooks for business users, while we test V131 wine red fuselage, but the whole style of stable without publicity, Matt effect of metal fuselage roof inlaid with a round Dell LOGO in the Middle, with the top covers the front of the composite material with a black border, simple fashion. We can see from the above diagram, before Dell V131 preserves with Dell's exclusive floating hinge design. Compared to sink-style fuselage hinges, this design minimizes the notebook screen and distance between the eye, so that users in a limited space, better visual effect. But this design also limits the maximum opening angle of V131 (about 130 °).


Due to the compact body, the battery takes up more space on the back of the fuselage, so Dell V131 interfaces are mainly located on both sides of the fuselage, behind only power supply design on the fuselage. Interface types and layouts, V131 is equipped with 2 USB3.0 interfaces, 1 USB2.0 interface, as well as VGA, HDMI, RJ45 network interface, so you can meet the needs of our daily use.


Worth mentioning is configured Dell V131 USB2.0 interface supports off charging function, under the State of the machine is shut down with 5 v, 0.5A of electricity, to charge devices such as mobile phone, MP3, iPad, so design is particularly practical at the time of travel.


Compared to previous generation V130 integrated backplane design, Dell V131 provides for rapid removal of the hard drive bezel upgrade memory, the user simply unscrew the screws for the upgrade operation. In addition, V131 min of a half-height PCIE interfaces are also provided, enhancing the machine's scalability. But it is regrettable that, Dell V131 bezel is not set to clean up the dust at the bottom of the fuselage, if you need to clean up the dust machine apart, this highly difficult for ordinary users.


As a 2011 launch of a Dell notebook, V131 with Dell as the other models, comprehensive enabling a new generation of chocolate keyboard, and has a backlight function, not only can illuminate keyboard in a dark environment, while chocolate keyboard key cap space between larger, easier to clean. On the right side of the palmrest, Dell V131 provides fingerprint identification device, upgrade your laptop's data security. Material aspects of the palmrest, palmrest V131 picked a composite, the surface is matte textured palms sitting on top of feeling more comfortable.


This time we test the Dell V131 is equipped with 11.1V/65Wh lithium-ion battery, battery capacity for a 13-inch super thin and light notebook, at a high level, and it also let V131 in predominantly Office Mobilemak 2007 has 6 hours 06 minutes battery life test of battery life. Such a score higher than the average level of the similar notebooks. Dell laptop battery.


Dell Intel Core i5 2450M processors V131, 2.5GHz GHz, supporting Intel's second-dairuipin technology, maximum frequency Quad speed up 3.6GHz. CINEBENCH R10 10,428 multithreaded scores, compared with common i5 2410M performance 8% to upgrade.


As a flagship portable business laptop, Dell V131 weight 1.8KG, thickness 2.2CM of the fuselage, while not the ultimate thin, but its portability should be affirmed. Mention V131 core i5 2450M and 750GB were also carrying large hard drive capacity, not only has the strong business performance while also provides plenty of storage space, this is the ultimate thin and light notebook can not achieve.


Apart from above features yiwai, Dell V131 for we provides has metal material fuselage top cover, and anti-glare light fog surface display, and backlight keyboard, and fingerprint recognition, and rich of interface configuration and so on characteristics, can said V131 is a paragraph integrated quality higher of products, machine design no obvious of defects, if non-to said said it of insufficient, I think a total four points: first is cleanup dust comparison trapped, difficult needs to machine apart; second is Qian bleach type fuselage hinge, makes its maximum opening angle received limit ; And the third is the official price of GBP649 higher than; is it configured HD3000 core IV video game performance is relatively weak. But its positioning in the market for portable business, 4th game performance disadvantage weaker should not be.

2012年1月9日星期一

Cool silver metal cyclone Dell 14R frontal type evaluation

Cool silver metal cyclone Dell 14R frontal type evaluation.


Spirit Inspiron 14R laptop is Dell student-oriented home users launched classic series, it has been conforming to a user's needs, continuously improve their design, and strive to provide us with the best notebook products. Especially in early 2011, Dell, not only in upgrading 14R to second daikurui platform, and also introduced the replaceable colour shell 14R and this time we test-14R front.


Dell-14R front in the area of machine design, continued the 14R smooth body lines, while the fuselage material by LCVM fancy steel wire material upgrades to metal materials, design style more sobering fashion.


On the machine configuration, Dell 14R Feng-Edition Powered by Intel Core i5 2450M processors, than core i5 2410M have stronger performance. In addition, 14R front Edition is also equipped with 2GB graphics HD6630M graphics, combined with 4GB RAM and 500GB hard drive, not only to meet the demands of everyday Office applications, as well as low quality in running smoothly for most popular 3D games, the whole configuration is very balanced. Then let us for a more detailed understanding of Dell-14R front.


As an upgraded version of the Dell 14R, Dell 14R front remained the original die design of the series, but on the material of the fuselage, popular fully commissioned metal material and machine interface of distribution has been adjusted. Dell-14R front there are both red and silver colors, this time we are silver-gray version of the test, its fuselage top cover with anodized aluminum materials, surface treated wire drawing processing, machine gives a cool feeling. Compared with the normal version 14R LCVM drawing of shiny steel not only provides more rigidity, while enhancing the whole texture.


In addition, Dell 14R interface configuration is very rich, it gives us 2 USB3.0 interfaces, 1, 1 x USB2.0 interface eSATA/USB2.0 interface, HDMI and VGA interfaces, and the reasonable distribution of interface in the fuselage sides and back. Can say that Dell 14R-front version is the same notebook interface configuration in one of the best.


Most new generation Dell Notebooks have adopted the popular chocolate keyboard, Dell 14R front-we test Edition is no exception, also equipped with a chocolate keyboard and the keyboard layout and normal version of 14R is basically the same. Although belonging to the keyboard, but configured Dell 14R chocolate keyboard key caps edge after smoothing treatment, and key Cap surface has a certain number of radians, this design not only more comfortable to use, but also line with the overall design style, highlight Dell 14R smooth lines. Dell touchpad-14R front area is relatively modest, specially frosted surface treatment, use more smoothly, more sensitive cursor control. In addition, 14R front above the touchpad-type Edition comes with a touchpad working status indicators, when the touchpad is disabled, then, the LEDs are lit.


4-hour Dell battery life. Dell laptop battery.
14R frontal type 11.1V equipped with lithium-ion batteries, in predominantly Office Mobilmark 2007 battery life tests, its battery life time of 4 hours, 10 minutes, this achievement and roughly in the same type.


We tested Dell-14R front carry Intel's latest core i5 2450M processor, it is the i5 2410M upgraded version, both using the same internal structure, but i5 2450M at up higher. CINEBENCH R10 's points of view, the core i5 performance than i5 2410M 2450M by 7%. Dell-14R front 14R and although other models carry positioned midrange HD6630M discrete graphics, 14R front type of graphics larger, upgrading from 1GB to 2GB. From a 3Dmark score, 14R front version and is not configured because of the larger memory and higher scores, the GPU end scores 16,417 and 1G memory HD6630M is basically the same.


As an upgraded version of the popular models sold in 14R, Dell 14R has not only brought us cold metal fuselage, it also receives a 14R consistent high-quality workmanship and rich interface settings.
But Dell 14R front type version of fuselage bottom only for we reserved has for upgrade memory of fast demolition bezel, if needs upgrade memory or cleanup dust needs will machine apart, this is 14R front type version more obvious of insufficient of Department, addition, Dell 14R front type version regardless of is in machine performance Shang also is other performance performance Shang are and equal positioning notebook is same of level, overall performance zhongguizhongju.

2012年1月3日星期二

Android thin and smart this Toshiba AC100 first tour

Android thin and smart this Toshiba AC100 first tour.
 

Recently, Toshiba has introduced a new Android-based system of ultra-thin smart book AC100, this product Toshiba aimed at business people who built the first cloud computing and entertainment market Smartbook product round the dream of many cloud computing experience. Toshiba AC100 match NVIDIA Tegra processor can display any response faster than Microsoft operating systems, run faster and consume fewer resources, much more numerous advantages of simple operation. Today we IT168 first got this Toshiba AC100, formal prior to its evaluation, the first time to see AC100 details some of the features and appearance.

Toshiba AC100 cloud computing concepts first introduced for Toshiba digital products, operation and accessories for all data transfer based on server platforms, makes it easier to store, share, exchange of data, so that users can use a computer experience to Smartphone services provided by, as a range of mobile phones and laptops digital products. AC100 gives business people the best option, but also of love and fashion crowd to the cloud's first experience, and achieve their dreams free entertainment and communication.

Configuration, Toshiba AC100 with a NVIDIA Tegra 250 processor, clock speed 1.0GHz, standard 512MB DDR2 333MHz memory and 16GB hard drive, NVIDIA Ultra Low-power GeForce video cards. Toshiba AC100 with a 10.1-inch screen sizes, with a 1.3 million pixel camera, size and General Internet, but only 870 grams in weight. Interface, with USB, mini USB, HDMI, 3.5 mm headset jack and SD card reader. The following, to feel the Toshiba AC100 under the appearance of the details.

Packing and overall look

Toshiba AC100 and General 10-inch NetBook is actually about the size, but it more slim than many netbooks, most thin fuselage only 14mm, with 870g of weight, better portability than most. AC100 on the back cover has a diamond lattice pattern design, in addition to appearance more skid-and fingerprint-proof effect. Identified on the keyboard are in the yellow, c wrist support and parts of the border have adopted the same pattern design and top cover.

Details of the screen and keyboard

Toshiba AC100 with a 10.1-inch screen size with the NetBook, and do not use narrow border design. The center of the screen has a 130W megapixel camera on the left microphone. As a result of the Android systems, Toshiba AC100 on some of the key symbols and notebooks under Windows systems vary. And c the keyboard parts are made of the same texture as top cover.

Interface layout

Toshiba AC100 interface relative to netbooks in General, there are some few, mainly is the number of USB interface, only a freshman small. Others have a HDMI interface, an audio output interface, a card reader and a power connector this about three. Battery capacity while only 25Wh, however, because the processor and video card's power consumption is relatively low, battery life should not be underestimated, in the subsequent final evaluation will be reported in time. toshiba laptop battery.