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2011年2月27日星期日

Laptop Battery tips for repair a 'smart' battery

Some basic rules must be followed in repairing a 'smart' battery. If the cells are weak, cell replacement makes economic sense. While Nickel-based cells are readily available, Lithium-ion cells are not sold on the open market. Most manufactures offer them only in a completed HP pavilion dv6000 Battery hp dv2000 battery pack, together with protection circuit. This precaution is understandable when considering the danger of explosion and fire if the cells are assembled in a careless way. Always replace the pack with the same chemistry cells.sony vgp-bps2c laptop battery
During cell replacement, the circuit of many 'smart' batteries must be kept alive with a supply voltage. Disconnecting the circuit, if only for a fraction of a second, can erase vital data and render the circuit unusable. To assure continued operation when changing the cells, connect a secondary voltage through a 100 Ohm resistor before disconnecting the cells. Remove the secondary supply only after the circuit is fed with the needed operating voltage from the new cells.
The open terminal voltages of the replacement cells should be within 10% of each other. Welding the cells is the only reliable way to get dependable service. Attention must be paid in limiting the heat transferred to the cells during welding. Excess heat can damage the cells.
During storage, each cell has self-discharged to a different charge level. This is especially important on Nickel-metal-hydride. To assure proper charge of all cells without overcharging some, trickle charge the newly repaired pack for about 14 hours, then apply a charge, discharge and charge cycle. Such a cycle is also needed to reset the battery's fuel gauge circuit. Lithium-ion can accept a normal charge lasting about 3 hours. The Cadex C7000 Series dell vostro 1000 battery Dell latitude d630 laptop battery analyzers feature a program that performs this priming function automatically.
Once the connection to the battery terminals is established, charging should be possible. If the charge current stops after 30 seconds, a digital code may be required. Some battery manufacturers go as far as to add a defined end-of-life switch. If a preset age, cycle count or capacity is surpassed, the battery stops functioning. When asking why such codes are added, the manufacturers explain that enduring safety can only be guaranteed if the battery is tamper-free and well performing. This makes common sense but the leading motive may be pricing. In the absence of competition, replacement batteries can be sold at a premium price. Newer Dell latitude c400 batteries dell kd476 battery are generally more service friendly than older ones. http://www.bestlaptopbattery.co.uk

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It is recommended to utilize the thermistor during charge and discharge to protect the battery against over heating. The thermistor can be measured with the Ohmmeter. The most common thermistors are the 10 Kilo Ohm NTC type, which read 10kOhm at 20°C (68°F). NTC stands for negative temperature coefficient, meaning that the resister decreases with rising temperature. A positive temperature coefficient (PCT) will increase the resistance. Warming the battery with your hand may be sufficient to detect a change in resistor value.
An SMBus battery contains permanent and temporary data. The permanent data is programmed into the battery at time of manufacturing and includes battery ID number, battery type, serial number, manufacturer's name, and date of manufacture. The temporary data is acquired during use and consists of cycle count, user pattern and maintenance requirements. Some of this information is renewed during the life of the battery.
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2011年2月26日星期六

HP laptop display replaced Guide help you save money

When it comes to dissembling a laptop computer, not mattering if it is the entire system or just a part, you need to take into account that you will need some skills, patience and the process might last a bit. Components are small, there are a lot of tiny screws and you need to carefully disassemble and put back everything together the way it was. When it comes to replacing a HP laptop display, you are facing with a moderate task; you will need a small screwdriver and a flat head screwdriver.
When the display is gone, then you definitely need connect the system to an external monitor and thus you will not be able to walk around with your laptop, so where is the joy then? But luckily, you can replace a HP laptop display and you can do it yourself if you follow some steps. In this way you will learn more about your laptop computer and you will also save some money.
If you are wondering how to replace a HP laptop display, then you are in the right place as here you will find the basic information and steps on how to do it. First of all, you need to turn off your laptop and unplug the AC adapter. This process must be done whenever you need to disassemble your laptop computer. Now just turn the laptop upside down and release the lever for the battery. In order to remove the battery you need to push the release lever. When you removed the battery, place it aside or in a container with all the other parts that will be removed and the screws. Now you need to remove the keyboard cover and in order to do this you will have to take the two hinge cover screws out. Taking out the cover needs some attention, so carefully insert the flat head screwdriver under the cover at the right end and then in the middle and on the left side as well. Now you can lift up the cover and put it aside.
At the rear panel of the laptop you will find two screws that need to be removed. In order to remove them, you should go from left and right antennas and then you will be able to pull them away. Now you have access to the motherboard and you can disconnect the display cable from it. To the top of the case there are also some retaining screws that also need to be removed. These hold the display assembly to the top case and after you have removed them you can carefully lift the assembly off. If you have gone through all the process, you should have a new display to replace the broken one. This needs to be removed from its package and placed into its place on the laptop. Using the cable, connect the display assembly to the motherboard and as final point you need to reassemble the case back and turn the display on in order to see if it works.
These said, you have now the steps in order to replace a HP laptop display. As you can see, you don’t need to disassemble the whole laptop in order to get the job done.
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2011年2月23日星期三

Apple Technology - Apple Patent Could Improve iPhone Battery Life

Apple like everyone else, is looking to increase the battery life of its mobile devices. The lithium-ion battery found in current model iPhones takes up a large amount of space yet still often fails to meet our power-hungry needs. A patent revealed by AppleInsider could mean that better batteries are in the works.
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Apple's idea is to make current batteries hold more energy without increasing their size. High-density power cells would also up energy density without increasing charging times or reducing minimum life cycle. A charging technique described as multi-step constant-current constant-voltage (CC-CV) would be used to achieve this higher energy density.
Apple plans to implement a multi-stage charging process that would be compatible with the new high-density battery design. By adjusting the charge rate as the battery becomes more full, battery life can be optimized regardless of temperature changes or the charge state of the battery. The patent, titled "Increasing Energy Density in Rechargeable Lithium Battery Cells," was first filed in August 2009 with the US Patent and Trademark Office.300px IPad 022 Apple’s Technology’s Leverage against Other iPad Competitions
Aside from increasing the capacity of existing batteries, Apple is also excited by the prospect of smaller batteries that provide more power. Any extra space inside mobile devices can be used to pack more features into a smaller form factor. Consumers are demanding more from their mobile devices and battery power is a major stumbling block for manufacturers.
There's no telling when a high-density lithium-ion battery might make it into future iPhones, or even other products such as MacBooks and iPads. Apple will be sure to let everyone know if and when these designs make it into a production device.
When Apple has made the iPod in 2001, there have been endless competitors and imitators showing up in the market. But due to the versatility and technology of the product, Apple has won. However, as Apple had launched another gadget, the iPad, the same war would seem to repeat again.
This was what CNET.com Senior Editor for Portable Entertainment Donald Bell held in opinion in his blog. He enumerated on the iPad’s many features and how it has leveraged the product and its’ technology from among its main competitors like Motorola and Google. According to him, Google of all Apple’s competitors are making the closest steps.
Aple’s iPad is said to last for ten hours of browsing the web on Wi-Fi, listening to music or watching video. This time would be one hour shorter when browsing is performed via 3G networks. RIM’s hesitation of providing official figures has been considered as an argument for those who believe that the PlayBook’s battery would not match in any case the iPad’s longevity.
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Will iPad replace the laptop? by bestlaptopbattery.co.uk

If you own an iPad – you don’t need a laptop. Although Apple designed it as a content consuming device, iPhone users are more creative and view it as a useful tool to manage and execute tasks outside the house as well. Thus, despite iPhone developers mostly concerned with applications that allow leaving the computer at home, you can see a Hollywood director using the iPad to manage the set, music magazines displaying the iPad as a production and playing tool and painters painting directly on the iPad.
The benefits in working on the iPad are plenty; it is lighter than any other Netbook, has a longer battery life (you don’t have to carry a charger around), the virtual keyboard does require some adjustment but responds quickly and working with only one screen prevents distractions. The question that remains is – how do we turn the iPad into a tool and leave our computer behind?
Get a better keyboard
The iPad’s virtual keyboard is good enough to be called “an authors dream machine” by Xander Davis – a games designer, author and musician. And still, if you intend to type a lot it’s better to invest in a real, quality keyboard. It is recommended to choose a light keyboard that can be thrown in the bag and it is important to remember that all keyboards work on batteries and so charging them along with the iPad is important. It is important to test the product in the store. The keyboard variety is large and you must feel comfortable with the material and shape of the one you select.
One option is the Dart Cheng keyboard reminiscent of the Apple keyboard. It includes a number of media keys to control the player functions. Another option is the iKeyboard that also includes a cover for the iPad.
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2011年2月12日星期六

Battery information:New fast-charging battery technology ideal

February With the world going mobile and billions of new devices requiring electrical storage, battery technology is almost certainly due for a renaissance in the near future and recent developments suggest MIT will play a role in the next significant battery technology. Less than a week ago, we reported on work being done by MIT's Laboratory for Electromagnetic and Electronic Systems (LEES) that could become the first technologically significant and economically viable alternative to conventional batteries in 200 years. Now a second new and highly promising battery technology is emerging from MIT - a new type of lithium battery that could become a cheaper alternative to the batteries that now power hybrid electric cars.chrysler electric car line 05 Is The Electric Line Of Chrylsers As Dead As The Company?
Until now, lithium batteries(Dell studio 1535 battery,Dell studio 1536 battery,Dell studio 1537 battery,Sony vgp-bps14 battery) have not had the rapid charging capability or safety level needed for use in cars. Hybrid cars now run on nickel metal hydride batteries, which power an electric motor and can rapidly recharge while the car is decelerating or standing still.
But lithium nickel manganese oxide, described in a paper to be published in Science on Feb. 17, could revolutionize the hybrid car industry -- a sector that has "enormous growth potential," says Gerbrand Ceder, MIT professor of materials science and engineering, who led the project.
"The writing is on the wall. It's clearly happening," said Ceder, who said that a couple of companies are already interested in licensing the new lithium battery technology.
The new material is more stable (and thus safer) than lithium cobalt oxide batteries, which are used to power small electronic devices like cell phones, laptop computers, rechargeable personal digital assistants (PDAs) and such medical devices as pacemakers.
The small safety risk posed by lithium cobalt oxide is manageable in small devices but makes the material not viable for the larger batteries needed to run hybrid cars, Ceder said. Cobalt is also fairly expensive, he said.
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The MIT team's new lithium battery contains manganese and nickel, which are cheaper than cobalt.
Scientists already knew that lithium nickel manganese oxide could store a lot of energy, but the material took too long to charge to be commercially useful. The MIT researchers set out to modify the material's structure to make it capable of charging and discharging more quickly.
Lithium nickel manganese oxide consists of layers of metal (nickel and manganese) separated from lithium layers by oxygen. The major problem with the compound was that the crystalline structure was too "disordered," meaning that the nickel and lithium were drawn to each other, interfering with the flow of lithium ions and slowing down the charging rate.
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Lithium ions carry the battery's charge, so to maximize the speed at which the battery(Asus a32-f3 battery,Dell latitude e4300 battery,Dell studio 1735 battery,Dell studio 1737 battery,Dell latitude e6400 battery) can charge and discharge, the researchers designed and synthesized a material with a very ordered crystalline structure, allowing lithium ions to freely flow between the metal layers.
A battery made from the new material can charge or discharge in about 10 minutes -- about 10 times faster than the unmodified lithium nickel manganese oxide. That brings it much closer to the timeframe needed for hybrid car batteries, Ceder said.
Before the material can be used commercially, the manufacturing process needs to be made less expensive, and a few other modifications will likely be necessary, Ceder said.
Other potential applications for the new lithium battery include power tools, electric bikes, and power backup for renewable energy sources.
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