Types of battery

There are a number of different types of household batteries used by householders for a variety of purposes. The three main types are:

Wet-cell: Lead acid batteries used to power vehicles and by industry.

Dry-cell non-rechargeable: These are the most common types of household battery.

General purpose disposable household batteries include:

  • Zinc carbon used in low drainage appliances such as torches, clocks, shavers and radios.
  • Zinc chloride used in similar applications.
  • Alkaline manganese used in personal stereos, radio-cassette players. Less prone to leaking than the above two types and longer lasting.
  • Primary button cells:
    • Mercuric oxide used in batteries for hearing aids, pacemakers, photographic equipment.
    • Zinc air – an alternative to mercuric oxide button cells – used for hearing aids and radio pagers.
    • Silver oxide used for electronic watches and calculators.
    • Lithium used for watches and photographic equipment.

Dry-cell rechargeable – general purpose rechargeable batteries for the above uses, and also including Nickel cadmium, Nickel metal hydride and Lithium-Ion batteries used in power tools, cordless appliances, mobile phones etc.

  • Nickel cadmium (NiCd) batteries represent one of the fastest growing sectors in the battery market. Used for cordless power tools, personal stereos, portable telephones, lap-top computers, shavers, motorised toys etc, with a life of 4-5 years.
  • Nickel metal hydride (NiMH) batteries are a less environmentally harmful alternative to NiCd and tend to have a longer life.
  • Lithium ion (Li-Ion) batteries have a greater energy storage capacity than NiCd and NiMH batteries.

Using rechargeable batteries reduces the number of batteries requiring disposal, but 80% of them contain nickel cadmium, a known human carcinogen, and therefore need to be disposed of safely. sourse:http://www.wasteonline.org.uk/resources/InformationSheets/Batteries.htm


July 18, 2008 at 9:03 pm Leave a comment

What to Buy, a Notebook or Desktop PC?

The performance capability of notebooks has been increasing for years: in many respects, mobile computers no longer lag behind their desktop counterparts. When purchasing a new computer these days, many users wonder whether a bulky tower CPU is even necessary, given the advantages of a notebook.

If you decide to purchase a notebook, performance is often not as decisive a factor as design, or various additional functions such as wireless capability or the ability to eject CDs when the notebook is turned off. Even if such features tempt you to buy, it pays to keep a cool head, because when compared to desktop computers, notebooks can be difficult or impossible to upgrade. You should consider the hardware very carefully, to ensure that it meets all of your needs.

If watching movies on the go is important to you, then a DVD-ROM drive and a sizable screen are musts. In this respect, notebooks with 17″ screens are considered the cream of the crop. Now that Blu-Ray has won the exhausting format battle to become DVD’s successor, we can expect to start seeing a large number of notebooks equipped with Blu-Ray drives. However, playing such high-resolution video material puts even higher demands on the hardware. Intel has already responded, and in the course of introducing mobile processors in its 45 nm manufacturing process, has also rejuvenated its mobile computer platform (Santa Rosa). These modifications have also improved the playback capabilities of high-resolution video material (see also article: Notebook comparison: Penryn vs. Merom).

Manufacturers are reacting to these changing circumstances in the notebook market sector. Acer, for example, has produced various models optimized for multimedia use, to attract customers. The 6920 and 8920 series boast 16″ and 18.4″ displays respectively, and promise complete viewing satisfaction in full HDTV resolution. However, performance like this comes at a price: interested buyers have to reach deep into their pocketbooks. The smallest model in the 6920 series costs $1,855.13, while the largest 8920G-934G64BN model is tagged at a whopping $2,937.30.

But is it really worth it to anyone to pay so much for a notebook? What could you get if you were to invest an equivalent sum in a desktop? The following article will address these questions.

source: http://www.tomshardware.com/

June 23, 2008 at 6:53 pm Leave a comment

It’s Official! The Death Of HD-DVD

It is finally over, the fat lady is singing!

The inevitable has finally happened. Toshiba have cancelled their HD-DVD format and put an end to the Hi-Def war with its rival Sonys Blu-Ray… thank god! After two years of spatting, boring us consumers to death and just being annoying in general, Toshiba have finally raised the white flag and conceded that the fat lady is in fact singing.

Toshiba have now officially pulled the HD-DVD plug and will cease production of all its HD-DVD players, discs and accesories by March 2008. This is a blow for the early adopters of the HD-DVD format and i suppose i do sort of feel sorry for them but in all honesty you should really know by now not to jump the gun when these type of spats between rival companies are ongoing, unless you buy both!

If you are one of those who has been sitting on the fence and waiting for a winner to be announced, it is now time for you to go out and treat yourself to a Blu-Ray player. Hopefully now that Blu-Ray is the sole provider of Hi-Def material, the prices will come down. That was definitely one advantage HD-DVD had over its nemesis, prices!

The only thing that has really got me thinking from the death of HD-DVD is the little matter of the Xbox 360. Will we being seeing an Xbox 360 with a built-in Blu-Ray drive or will they be throwing another bloody add-on drive at us and if so, how long is it going to be before we see one? Why don’t you give us your thoughts on the HD-DVD slaying and your Xbox ideas by leaving us a comment, we love to hear what you think.

June 18, 2008 at 4:15 pm Leave a comment

Google’s patented PigeonRank

Google’s Pigeon Rank

When a search query is submitted to Google, it is routed to a data coop where monitors flash result pages at blazing speeds. When a relevant result is observed by one of the pigeons in the cluster, it strikes a rubber-coated steel bar with its beak, which assigns the page a PigeonRank value of one. For each peck, the PigeonRank increases. Those pages receiving the most pecks, are returned at the top of the user’s results page with the other results displayed in pecking order. More can be read here

June 18, 2008 at 3:56 pm Leave a comment

Laptop Battery

Most laptops now use lithium ion (Liions) batteries. Lions should be managed differently from the Nicad or NiMH batteries used in older laptops. In particular, Lions should not be run all the way down to prevent “memory effect”. First, they don’t have a memory effect, and second, running them down tends to reduce their capacity. If the laptop does not need the battery it should be run to about 40% charge and stored in a cool place. Liion batteries go bad whether used or not, so only buy new Liions. Typical life is 2-3 years.

Laptop Battrties are specifically designed for each laptop brand and model. Laptop batteries are all fundamentally different from one another and cannot be substituted unless the laptop has been pre-configured from the manufacturer to accept more than one type of battery chemistry.

June 18, 2008 at 1:54 pm Leave a comment

Laptop Computer Battery, Digital Phone and Camera Battery

As you’re buying batteries, it’s important to find out two things: how long they last and how much they cost. You’ll also want to figure out exactly how the battery works with the device, and the length of time it needs to recharge. You don’t want to be on a business trip trying to figure out batteries right before a big presentation!

The first rechargeable batteries for laptops were nickel cadmium (NiCd) batteries. They didn’t cost much, worked very well and could be used in many different devices. However, as more efficient and lighter batteries have come on the market, many laptop companies have discontinued using NiCd batteries.

Nickel metal hydride (NiMH) batteries, for example, were one better option because they had greater output, cost less, were safer and more reliable. NiMH batteries had one major drawback, though: the “memory effect.” Because they had to be fully discharged before they could properly recharge, these batteries were seen as a time-consuming hassle. Older models of laptops may have these batteries.

Lithium ion (LiON) batteries are the standard batteries for most laptops made today. They weigh much less than previous batteries and they don’t have the memory effect of NiMH batteries. While they have many advantages, they’re also more expensive than other laptop batteries.

While cell phones are getting cheaper these days, they are still a costly purchase. To get the top of the line model you want, it may be necessary to save up. And once you have it, you’ll want to stick to a tight budget so you can afford all the monthly charges and extra fees. The cost of high-quality cell phone batteries is another concern to keep in mind.

Most cell phones have a basic battery, but many people choose to purchase a better battery with a higher capacity. Like so many things, the cheapest option may not be the best. As the old saying goes: you get what you pay for. It’s possible to find a high-capacity battery for a good price, but it could be a used, restored battery. Usually made with old parts, restored cell phone batteries don’t usually function as well as new ones. If the price sounds too good, chances are you’re being sold a restored cell phone battery.

Most people know that a digital camera battery is an essential accessory for their digital camera. Maybe you found out that your digital camera battery consumes power so quickly that you can hardly take 50 pictures before you need to recharge or replace the battery. On the other hand, some people have high-quality digital camera batteries that seem to last forever. Of course, you just need to consider your own needs and uses for your camera before you buy a digital camera battery.

Two kinds of digital camera batteries are available today. The AA battery is very common, as is the rechargeable digital camera battery. Also known as proprietary batteries, these are usually made by the manufacturer.

June 18, 2008 at 1:52 pm Leave a comment

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