Archive for September, 2009

 
26 09/09

If you can handle the odd touchpad, the Dell Inspiron Mini 10v is a solid 10 inch netbook with good build quality

All told, this is an enticing ultraportable. We wish there were more space between the keyboard and the touch pad, and that the touch pad were recessed slightly to minimize thumb-bumping and mouse-jumping, but those are nitpicks, not deal-breakers. And given the low $799 price, we can’t complain much about the performance. If you need the functionality of a notebook with a full-fledged processor along with ultimate portability, the Asus UL30A-A1 is your best bet. It’s the only $800 ultraportable we’d recommend. If price is paramount, but you want more choices, you’ll have to sacrifice performance and go with a netbook, or sacrifice portability and go with a bigger thin-and-light laptop.

The computer also comes with Microsoft Works and Microsoft PowerPoint Viewer preloaded as well as McAfee Internet Security. It’s not the most impressive set of software, but you can always uninstall any programs you don’t need to free up disk space.

If you can handle the odd touchpad, the Dell Inspiron Mini 10v is a solid 10 inch netbook with good build quality, a decent keyboard, and above average battery life. But the touchpad may be a dealbreaker for some people. If you generally plug in a mouse, or don’t have a problem with the Inspiron Mini 10v touchpad’s integrated mouse buttons, then don’t sweat it. At $299 and up, the Mini 10v gives you a decent bit of bang for your buck.

From the beginning, HP’s approach to Voodoo was more modest than Dell’s approach to Alienware, the boutique PC maker it acquired in March 2006. Dell brought Alienware as a brand into its consumer division, but uses it only on a gaming desktop, a gaming notebook and gaming mice and keyboards. The biggest change seems to be the brand’s scale: Before the acquisition, Alienware was available in six countries; it’s now for sale in 37.

Slim PCs were the earliest style of small form factor system. Essentially, they were desktop systems that removed some of the bulk by removing space for full sized expansion cards. This reduced the desktops height or width by half. Since that time, they have reduced their size even more through the reduction of component sizes. They still tend to have expansion slots, but have “half-height” slots that require specific expansion cards that are difficult to find.

HP seemed more ambitious at first about bringing Voodoo into the mainstream and not keeping it a strictly gaming brand. Sood writes that though he wanted to make the Voodoo Envy available in Dubai, London, and India, that hasn’t happened yet.

Businesses tend to prefer standard computers that don’t have a lot of expansion capabilities. This is done because the companies depreciate the cost of the computers over their life span or they lease them. Once a system has reached its “lifespan” it is replaced by a new updated computer. Because there is no need for expansion, an integrated system such as a slim PC makes perfect sense. The computers don’t have to be top of the line when it comes to components since most business computing done is for word processing, spreadsheets and corporate communications.

http://www.shopokey.com

24 09/09

Lithium-ion Battery Life and Death

Lithium-ion battery packs are expensive, so if you want to make yours to last longer, here are some things to keep in mind:

  • Lithium-ion batteries age. They only last two to three years, even if they are sitting on a shelf unused. So do not “avoid using” the battery with the thought that the battery pack will last five years. It won’t. Also, if you are buying a new battery pack, you want to make sure it really is new. If it has been sitting on a shelf in the store for a year, it won’t last very long. Manufacturing dates are important.
  • Lithium ion chemistry prefers partial discharge to deep discharge, so it’s best to avoid taking the battery all the way down to zero. Since lithium-ion chemistry does not have a “memory”, you do not harm the battery pack with a partial discharge. If the voltage of a lithium-ion cell drops below a certain level, it’s ruined.
  • Avoid heat, which degrades the batteries.

Exploding Batteries
Now that we know how to keep lithium-ion batteries working longer, let’s look at why they can explode.

lithium-ion battery discharge mechanism
Several news reports in the past six months describe laptops with lithium-ion batteries that caught on fire.

If the battery gets hot enough to ignite the electrolyte, you are going to get a fire. There are video clips and photos on the Web that show just how serious these fires can be. The CBC article,”Summer of the Exploding Laptop,” rounds up several of these incidents.

When a fire like this happens, it is usually caused by an internal short in the battery. Recall from the previous section that lithium-ion cells contain a separator sheet that keeps the positive and negative electrodes apart. If that sheet gets punctured and the electrodes touch, the battery heats up very quickly. You may have experienced the kind of heat a battery can produce if you have ever put a normal 9-volt battery in your pocket. It a coin shorts across the two terminals, the battery gets quite hot.

In a separator failure, that same kind of short happens inside the lithium-ion battery. Since lithium-ion batteries are so energetic, they get very hot. The heat causes the battery to vent the organic solvent used as an electrolyte, and the heat (or a nearby spark) can light it. Once that happens inside one of the cells, the heat of the fire cascades to the other cells and the whole pack goes up in flames.

It is important to note that fires are very rare. Still, it only takes a couple of fires and a little media coverage to prompt a recall.

To learn more about lithium-ion laptop batteries and related topics, http://www.shopokey.com.

24 09/09

How Lithium-ion Batteries Work

Lithium-ion batteries are incredibly popular these days. You can find them in laptops, PDAs, cell phones and iPods. They’re so common because, pound for pound, they’re some of the most energetic rechargeable batteries available.

­ Lithium-ion batteries have also been in the news lately. That’s because these batteries have the ability to burst into flames occasionally. It’s not very common — just two or three battery packs per million have a problem — but when it happens, it’s extreme. In some situations, the failure rate can rise, and when that happens you end up with a worldwide battery recall that can cost manufacturers millions of dollars.

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