Heat affects Laptop Battery Life

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Heat is a killer of all batteries and high temperatures cannot always be avoided. This is the case with a battery inside a laptop, a starter battery under the hood of a car and stationary batteries in a tin shelter under the hot sun. As a guideline, each 8°C (15°F) rise in temperature cuts the life of a sealed lead acid battery in half. A VRLA batteryfor stationary applications that would last 10 years at 25°C (77°F) would only live for five years if operated at 33°C (95°F). Once the battery is damaged by heat, the capacity cannot be restored. The life of a battery also depends on the activity and is shortened if the inspiron e1705 battery is stressed with frequent discharge.
According to the 2010 BCI Failure Mode Study, starter batteries have become more heat-resistant over the past 10 years. In the 2000 study, a change of 7°C (12°F) affected battery life by roughly one year; in 2010 the heat tolerance has widened to 12°C (22°F). In 1962, a starter inspiron e1705 battery lasted 34 months, and in 2000 the life expectancy had increased to 41 months. In 2010, BCI reports an average age of 55 months of use. The cooler North attains 59 months and the warmer South 47 months.
Cranking the engine poses minimal stress on a starter battery. This changes in a start-stop function of a micro hybrid. The micro hybrid turns the IC engine off at a red traffic light and restarts it when the traffic flows. This results in about 2,000 micro cycles per year. Data obtained from car manufacturers show a capacity drop to about 60 percent after two years of use in this configuration. To solve the problem, automakers are using specialty AGM and other variations that are more robust than the regular lead acid. Read more about Alternate Battery Systems. Figure 5 shows the drop in capacity after 700 micro cycles. The simulated start-stop test was performed in Cadex laboratories. CCA remains high.
Test method: The test inspiron e1705 battery was fully charged and then discharged to 70 percent to resemble the SoC of a micro hybrid in real life. The battery was then discharged at 25A for 40 seconds to simulate engine off condition at stoplight with the headlight on, before cranking the engine at 400A and recharging. The CCA readings were taken with the Spectro CA-12.
The cell voltages on a battery string must be similar, and this is especially important for higher-voltage VRLA batteries. With time, individual cells fall out of line, and applying an equalizing charge every six months or so should theoretically bring the cells back to similar voltage levels. While equalizing will boost the needy cells, the healthy cell get stressed if the equalizing charge is applied carelessly. What makes this service so difficult is the inability to accurately measure the condition of each cell and provide the right dose of remedy. Gel and AGM batteries have lower overcharge acceptance than the flooded version and different equalizing conditions apply. Always refer to the manufacturer’s specifications.
Water permeation, or loss of electrolyte, is a concern with sealed lead acid batteries, and overcharging contributes to this condition. While flooded systems accept water, a fill-up is not possible with VRLA. Adding water has been tried, but this does not offer a reliable fix. Experimenting with watering turns the VRLA into unreliable xps m1330 battery that needs high maintenance.
Flooded lead acid batteries are one of the most reliable systems. With good maintenance these batteries last up to 20 years. The disadvantages are the need for watering and providing good ventilation. When VRLA was introduced in the 1980s, manufacturers claimed similar life expectancy to flooded systems, and the telecom industry switched to these maintenance-free batteries,latitude d830 Battery ,inspiron 510m battery. By mid 1990 it became apparent that the life for VRLA did not replicate that of a flooded type; the useful service life was limited to only 5–10 years. It was furthermore noticed that exposing the batteries to temperatures above 40°C (104°F) could cause a thermal runaway condition due to dry-out.
A new lead acid battery should have an open circuit voltage of 2.125V/cell. At this time, the battery is fully charged. During buyer acceptance, the lead acid may drop to between 2.120V and 2.125V/cell. Shipping, dealer storage and installation will decrease the voltage further but the latitude d830 Battery ,inspiron 510m battery should never go much below 2.10V/cell. This would cause sulfation. Battery type, applying a charge or discharge within 24 hours before taking a voltage measurement, as well as temperature will affect the voltage reading. A lower temperature raises the OCV; warm ambient lowers it.

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Toshiba Portégé R830-138

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 Toshiba Portégé R830-138

We had to pick up our jaws up from off the floor too. It’s going to take a damn sight more than a sophisticated-sounding French moniker to distract you from this laptop’s gargantuan price. But the Toshiba Portege R830 must be an astonishing piece of kit, right?

Designed for the busy executive who wants a laptop that doesn’t interfere with the shape of a soft Italian leather briefcase, Toshiba’s wafer thin Port

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HP Pavilion dm1-4027ea

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 HP Pavilion dm1-4027ea

Overview

The HP Pavilion dm1-4027ea comes at an interesting time for portable PC laptops. Traditional laptops have had a turbulent ride of late, with a number of threats appearing to erode their market.

The first threat – netbooks – has been seen off pretty comprehensively. The diminutive machines offered a smaller, lighter and cheaper alternative, but at the cost of power and features.

In the end netbooks failed to capture the public’s imagination, despite the efforts of some great products, such as the Toshiba NB520-10U.

Tablets, however – especially the Apple iPad 2 and the Samsung Galaxy Tab 10.1 – haven’t had this problem, and have surpassed netbooks to become the laptop’s biggest threat. Sales have rocketed so that tablets have succeeded where netbooks failed. Offering slick interfaces, a huge selection of apps and usually attractive and portable designs, tablets are a force to be reckoned with.

Their Achilles’ heel at the moment is price. Top range tablets go for around £300-£400. You can get cheaper models, such as the Binatone HomeSurf 705 and ViewSonic ViewPad 7e, but they’re not very good.

HP pavilion dm1-4027ea review

A new front has now opened up from the high end of the laptop market, with Intel’s ultrabook format. These new laptops are incredibly thin, light and beautifully designed, as well as being powerful. The standout models of ultrabook is the Asus Zenbook UX31 and the Acer Aspire S3.

So where does this competition leave standard laptops in general, and the HP Pavilion dm1-4027ea in particular? Does it do enough to stand out in an already crowded market, and does the audience for that market even exist any more? The HP Pavilion dm1-4027ea starts with a strong foundation, with Hewlett Packard remaining a trusted and respected manufacturer of laptops.

The HP Pavilion dm1-4027ea’s stablemate, the HP Pavilion dm1-3100sa, has impressed as an ultra-portable laptop that doesn’t make too many sacrifices when it comes to performance. But now the spotlight is firmly on the HP Pavilion dm1-4027ea.

Specifications

HP pavilion dm1-4027ea review

The HP Pavilion dm1-4027ea is certainly a small laptop, with dimensions of just 29.2 x 21.5 x 3.2cm, and a weight of only 1.6kg. This makes it almost as small and portable as the much maligned netbooks but, crucially, it also has enough power to handle most tasks.

Packed onto the small chassis of the laptop are VGA, HDMI and Ethernet ports. There’s a combined headphone out/microphone in jack and three USB 2.0 ports. It’s a bit disappointing that there are none of the faster USB 3.0 ports included, since these are becoming increasingly common on new laptops.

To keep the computer small, there’s no optical drive for reading CDs or DVDs, so you’ll have to rip music and video to a USB stick to make the most out of this laptop’s media-playing capabilities.

HP pavilion dm1-4027ea review

HP bills the HP Pavilion dm1-4027ea as an “Entertainment Notebook PC”. This conjures up expectations of a machine that’s capable of handling media with ease, and maybe even a few casual games. Where the HP Pavilion dm1-3100sa was let down with its handling of high-definition content, we expect the HP Pavilion dm1-4027ea to have no such trouble.

On paper, things don’t look too bad. The HP Pavilion dm1-4027ea uses an AMD Radeon HD 6320M integrated graphics card. It comes with some automatic overclocking tools to give it a bit of a needed boost, and with DirectX11 support, it can handle low- to mid-range games.

Graphically demanding newer games are definitely a no-no, though. This is because while the AMD Radeon HD 6320M inside the HP Pavilion dm1-4027ea can theoretically use up to 1.92GB of memory for graphics, it doesn’t actually have dedicated graphics memory, so it needs to share memory with the rest of the PC.

HP pavilion dm1-4027ea review

This means if you’re running a few graphic-intensive programs, along with other applications that need memory, the strain is going to show. The 11.6-inch screen has a resolution of 1366 x 768, which is fine for high-definition movies.

Although there’s a lack of dedicated graphics memory, HP has been very generous by including 4GB of DDR3 RAM with the HP Pavilion dm1-4027ea. This is more than enough for most applications, and it’s nice to see that HP hasn’t hobbled the HP Pavilion dm1-4027ea by cutting the RAM to 2GB to lower costs.

Processor-wise, the HP Pavilion dm1-4027ea comes with a 1.65 GHz AMD Dual-Core E-450. This processor has been specially designed by AMD to work in laptops, with lower power consumption that leads to greater battery life and saves the components inside the HP Pavilion dm1-4027ea’s small body from overheating.

While it’s no competition for the Intel Core i5 and i7 processors found in higher-end (and much more expensive) laptops, this dual core processor is meaty enough for a lot of tasks, and pleasingly powerful, considering the size of the laptop.

Performance

HP pavilion dm1-4027ea review

TechRadar Labs

tech labs

3D Mark: 2,602
Cinebench: 1,433
Battery eater: 2 hours 59 mins 26 seconds

As with many laptops around this price range, the HP Pavilion dm1-4027ea’s performance really depends on what you’re using it for. Day-to-day computing on this laptop, such as writing on a word processor or browsing the web, is accomplished with little fuss, although there is a faint lag when starting up programs. We found that a bit of patience is required when selecting options or launching applications, with pauses of a few seconds sometimes.

Even with 4GB of RAM, multitasking can slow down quite a bit, especially if you’re browsing the internet while running a number of graphic-heavy programs at the same time, such as watching a movie or video editing.

The 320GB hard drive offers plenty of space but has a speed of just 5,400rpm (revolutions per minute). The faster a hard drive can spin, the faster the computer can open, move and edit files stored on the disk. With faster drives out there achieving 7,200rpm and even 10,000rpm, it does feel like the drive is a bit of a weak link.

The trade-off with a slower hard drive, however, is lower overall cost and a longer battery life.

HP pavilion dm1-4027ea review

Graphics performance was OK, but nothing spectacular, with a 3D Mark score of 2,602, which is on the low end even for laptops, and lower than the HP Pavilion dm1-3100sa‘s score. The Cinebench score of 1,433 using multiple cores was better, but still less than the HP Pavilion dm1-3100sa’s score of 1,985.

Despite the lacklustre benchmarks, our real world tests were more positive. Media playback itself was good, with no stuttering on standard-definition movie files.

The 11.6-inch screen displayed colours well and animations in particular looked great. The 1366 x 768 resolution actually benefitted full HD movies files, since the 1080p source was nicely downscaled to run on the smaller resolution, resulting in a sharp image. High-definition movies also play very well, with just a hint of screen tear, but no noticeable stuttering.

HP pavilion dm1-4027ea review

Much has been made of the HP Pavilion dm1-4027ea’s sound capabilities, with the inclusion of Beats Audio technology, exclusive to HP laptops. The built-in speakers sound great – definitely the best we’ve heard in a laptop from this price range. Audio is clear, with plenty of depth and none of the tinny qualities that often plague laptop speakers.

Battery life was a pretty standard three hours of intensive computing. That’s not awful, but we’ve seen laptops – such as the Acer Timeline X – with much longer battery lives.

Verdict

HP pavilion dm1-4027ea review

The HP Pavilion dm1-4027ea is a strange beast of a laptop indeed. On the one hand it can feel rather lacklustre and underpowered when doing unexceptional tasks. Windows 7 Home Premium can feel sluggish at times, and with a number of windows left open on the desktop, things can get pretty slow.

In this regard, the HP Pavilion dm1-4027ea can’t compete with a higher-end, more powerful laptop, or even a tablet that’s less powerful but has an operating system and apps that use the limited resources well enough to ensure a smooth user experience.

However, there’s no denying that when it comes to media playback – an important consideration due to HP’s labelling of the Pavilion dm1-4027ea as an entertainment-focused machine – this laptop actually performs very well. Movie content – both standard and high-definition – plays very well, and the built-in speakers provide audio that is well above average for a laptop.

The lack of an optical drive does limit its media playback options quite a bit, however, but if your media collection has gone fully digital, then this won’t be such a problem.

The small size and light weight is also a big factor, and this is certainly a more portable laptop than most.

If you’re after a light media-playing laptop then this is a good choice. For anything more demanding, look elsewhere.

We liked

Media playback is a big winner with the HP Pavilion dm1-4027ea. A lovely screen coupled with enough graphical power to run movies smoothly (bar the odd screen tear) makes this laptop a pleasure to watch movies on.

The battery life will just about make it through an entire film.

Better still is the audio quality of the built-in speakers, which really does sound great, and saves you the extra expense of buying separate laptop speakers such as the Logitech Laptop Speaker Z305.

The small size of the laptop is also a boon, making it easy to carry around wherever you go, with a slim and attractive design.

Even with the smaller keyboard, typing is comfortable.

We disliked

Outside of media playback, performance is pretty mediocre, with relatively impressive stats on paper not making a great impact in use.

The biggest culprit here is the 4GB of DDR3 RAM, which should give the HP Pavilion dm1-4027ea some punch, but actually still leaves the laptop struggling when there is too much going on at once.

Final verdict

If you want a light laptop for watching movies on, the HP Pavilion dm1-4027ea does what you want it to do. However, if you want to use it to work on, editing digital photos or anything more strenuous, then you’re going to be disappointed.

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Medion Erazer X6815

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 Medion Erazer X6815

Medion’s Erazer X6815 is a powerful and impressive all-round laptop with more than enough punch for your pound, thanks to the inclusion of Intel’s sophisticated second-generation Core i7 processor.

Gamers are the intended audience, which is obvious from the included GeForce GT 555M graphics card. Despite the powerful components, Medion has kept the price down to £699, and at this price it’s an absolute steal.

Unfortunately there are some build concessions. For a 15.6-inch laptop, the Erazer is quite the chubbster. At 2.7Kg and with a 37mm chassis, it’s heavy compared to other models of the same size, although it’s still compact enough to carry around without breaking your back in the process.

The glossy black design means it looks cool, but is a magnet for our fingerprints and dust. The glossy design stretches over the touchpad too, which sits with a slight indentation beneath the keyboard so your fingers can find it easily.

Sadly, the pad and keyboard have a cheap unreceptive clack and the individual keys are so loose in the chiclet array that we managed to get a couple caught underneath the casing. While typing is easy because the keys are isolated, we don’t hold out much hope for longevity before they break.

Excellent features

Fortunately, everything else is more than up to scratch. Four USB ports line the edges, with two at the super-fast 3.0 speed. VGA and HDMI connections fill out the right side, with nothing around the back and just a Blu-ray drive on the left. You also get a multi-format card reader, fingerprint scanner and a 1.3MP integrated web-cam.

Audio was solid thanks to the Dolby Home Theater v4 HD audio, provided by two speakers and a subwoofer for reproducing the sort of low-end rumble that underpins movie or games soundtracks. It’s not going to set the world on fire and disintegrated into a cacophony with the volume up, but was resolutely serviceable for film and music.

TechRadar Labs

tech labs

Battery Eater ’05: 169 minutes
Cinebench: 16627
3DMark 2006: 10555

Medion did a great job by adding a Full HD 1080p screen. It was less glossy, hence less vibrant, than most and the viewing angles disappoint. However, for a single laptop user in lower lights it played back HD video well, and it’s hard to complain at this price point.

As well as Intel’s excellent CPU and Nvidia graphics, the Erazer has 4GB of memory and 500GB of storage. With a great set of specifications under the hood, we had no issues with multimedia playback or multi-tasking with several apps open.

Kudos to Medion for compiling such a great array of specs at a low price point. Hardcore gamers looking to play the latest titles on maximum detail should look elsewhere, but for gamers and power-seekers on a budget, this is a genuinely great buy.

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How To Protect Your Mac Laptop From Heat In Summer

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How To Protect Your Mac Laptop From Heat In Summer

We’re officially in summer, the time that if we continue to use your Mac will have to use the laptop if we go away on vacation away from home or simply the time when our laptops suffer more from high temperatures. This post I will offer some tips to protect your MacBook, MacBook Pro or MacBook Air from heat and keep the laptop has problems with it. To achieve this, we will focus on attacking on two fronts: The accumulation of heat inside the laptop physically with simple cooling tips, and on the other hand, see what we can do from the operating system to minimize the impact on the CPU and prevent processes increase the energy required by the processor (and thus the heat to dissipate). With a little care and with these simple tips, should take care to the best of your little Mac laptop and alargaréis great life. My MacBook Pro is the model in late 2006, so bad I will not be doing to take care. Let’s see how.

Protecting the heat MacBook accessory pathway.
Let’s start from the outside. Use a portable means to move and expose many times in places unsuitable for proper heat dissipation. We can help you improve these situations in the following ways:

Remove the battery (if removable)
If we use the Mac inside a house, and we have no plans to move immediately, a good idea to remove the laptop battery. It is not battery protection issues, but rather of ‘space’: The inside of the notebook over and aerate the free volume of the battery will allow the heat to condense less. Of course, do only those portable Macs … The removable battery with battery soldered into the circuitry, which are better left.

Use a “lift”
If you have a desk similar to the photo, with a laptop connected to an external display, or just you use the laptop as main computer at home is a good idea to purchase an elevator. Is a kind of stand that “lifts” the laptop a few inches from the table. The free space is gained in the bottom makes the air circulate better in the back of the laptop, the area which is heated. Not being in direct contact with any surface (only small boom), the heat will cool more efficiently.
Personally I use the Griffin brand model (it’s coming out in the photo), made from aluminum and easily disassembled for transport. As a downside, the height is fixed and not adjustable. I recommend you dig out the different models and brands that offer elijáis that best fits your needs or tastes.

Take small “caps” to raise the laptop in the backpack
If we take your laptop on vacation, or are constantly moving from one place to another is a good idea to buy small “caps” of silicone that can be put on the back of the laptop and raise a few inches around the perimeter of the table Mac. Especially if the table is wood, it is imperative a solution or so, because the wood retains much heat and cool it takes a long time. You can buy these silicone caps or some similar solution in home plan, the important thing is that the Mac has some space below it.

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