Voltage-based state-of-charge is popular for wheelchairs

June 17 [Mon], 2013, 15:17
Measuring state-of-charge by voltage is the simplest method, but it can be inaccurate. Cell types have dissimilar chemical compositions that deliver varied voltage profiles. Temperature also plays a role. Higher temperature Aspire 5551 replacementraises the open-circuit voltage, a lower temperature lowers it, and this phenomenon applies to all chemistries in varying degrees.

The most blatant error of voltage-based SoC occurs when disturbing the battery with a charge or discharge. This agitation distorts the voltage and no longer represents the true state-of-charge. To get accurate measurements, the battery needs to rest for at least four hours to attain equilibrium; battery manufacturers recommend 24 hours. Adding the element of time to neutralize voltage polarization does not sit well with batteries in active duty. One can see that this method is ill suited for fuel gauging.

Each battery chemistry delivers a unique discharge signature that requires a tailored model. While voltage-based SoC works reasonably well for a lead acid battery that has rested, the flat discharge curve of nickel- and lithium-based batteries renders the voltage method impracticable. And yet, voltage is commonly used on consumer products. A “rested” Li-cobalt of 3.80V/cell in open circuit indicates a SoC of roughly 50 percent.

The discharge voltage curves of Li-manganese, Li-phosphate and NMC are very flat, and 80 percent of the stored energy remains in this flat voltage profile. This characteristic assists applications requiring a steady voltage but presents a challenge in fuel gauging. The voltage method only indicates full charge and low charge and cannot estimate the large middle section accurately.

Lead acid has diverse plate compositions that must be considered when measuring SoC by voltage. Calcium, an additive that makes the battery maintenance-free, raises the voltage by 5–8 percent. Temperature also affects the open-circuit voltage; heat raises it while cold causes it to decrease. Surface charge further fools SoC estimations by showing an elevated voltage immediately after charge; a brief discharge before measurement counteracts the error. Finally, AGM batteries produce a slightly Aspire 5741 replacementhigher voltage than the flooded equivalent.

When measuring SoC by open circuit voltage, the battery voltage must be truly “floating” with no load present. Installed in a car, the parasitic load present makes this a closed circuit voltage (CCV) condition that will falsify the readings. Adjustments must be made when measuring SoC in the CCV state by including the load current in the calculation. In spite of the notorious inaccuracies, most SoC measurements rely on the voltage method because it’s simple. Voltage-based state-of-charge is popular for wheelchairs, scooters and golf cars.

Logan team set both long and developed by the new system

March 19 [Tue], 2013, 11:55
According to "Nature" magazine's website reported on March 1, U.S. scientists have combined the two renewable energy technologies for the development of a new microbial reverse electrodialysis cell (MRC). This technologyreplacement 448007-001 not only to purify the wastewater, but also use of wastewater generation. The research is published in the March 2 issue of Science magazine.

Energy of the Hydrogen Energy Center of Pennsylvania State University and works, the study's lead author and director of the Institute for Environmental Studies, said Bruce Logan, the wastewater contains organic matter in the form of energy. Domestic wastewater containing the chemical 10 times the energy they need energy. Domestic wastewater plus the energy inherent in the wastewater generated by the livestock and food production is almost sufficient to maintain the operation of the nation's water infrastructure.

The new method uses a technique is a microbial fuel cell (MFC), can waste water in chemical energy into electricity and clean water can be used. MFC uses microorganisms to decomposition and oxidation of organic matter, this process will release the moving electrons to the anode. At the same time, the hydrogen ions in the water by proton exchange membrane into the cathode region of the independent. Be attracted by an electronic circuit from the anode to the cathode, resulting in a current. Hydrogen ions with the surrounding oxygen combine to form a clean water.

Logan team used another called reverse electrodialysis (RED to use clean water and seawater salinity gradient power generation) technology in order to obtain a higher energy density, when the "helper". When using RED technology, two different sources of water pump pressure through a pair of film, this film and the oppositely charged electrode connected to make positive and negative charges moving in different directions, when the ions towards their respective electrodes move , will generate electricity. However, this method requires a lot of film, and therefore high cost.

Logan team set both long and developed by the new system, called microbial reverse electrodialysis cell, the system contains a few of the film RED heap in an MFC, the cathode and the anode chamber between the proton exchange membrane is also located on MFC. Flow from the two systems are separate and operate independently but with increased energy density: RED heap will increase the current of the MFC at the same time, the voltage between the MFC electrode enables RED heap less membrane operations.

This system can operate a key RED heap using ammonium bicarbonate instead of seawater. This will increase the energy density, ammonium bicarbonate regeneration in the pile, the heap to become a closed system. The new system has been proven to 3 watts per square meter, the maximum energyNotebook batteries Lenovo L08O6D13 density.

The new system per cubic meter of organic hydro electric energy 0.94 kwh, whereas the traditional method of wastewater treatment per cubic meter of water would consume about 1.2 kwh of electricity. Latest methods will not only allow us to get more energy, so that we can better and faster the purification of wastewater. "Logan said.

The number of patent applications in the field of battery management system

March 19 [Tue], 2013, 11:49
Battery is the only energy of pure electric vehicles, in addition to its supply of car drivers driving power required, the working power of a variety of assistive devices in the car. The performance of the battery to a large extent determinesreplacement HSTNN-Q34C the car's driving performance, such as pure electric vehicles the driving range and acceleration or climbing power performance. Therefore, countries in the world of electric car batteries as a R & D focus, to give strong policy and financial support.

Since 1970 Propulsion Batteries Limited application for the first pure electric car battery patent application US3928080 almost every year a new patent application is submitted, especially after 1991, the pure electric vehicle with a battery of patent applications before as compared to fold increase.

Japan: Japan's pure electric vehicle battery research mainly concentrated in the lithium battery, followed by lead-acid batteries, nickel metal hydride batteries, sodium batteries. From the total amount of patent applications worldwide, Japan has a pure electric vehicle battery management system patent application for the largest number. Patent applications from Japan, in 6782 and pure electric vehicles with battery management system patent application, of which more than 90 percent of patent applications from Japan applicant. Regardless of ownership point of view from the world's patent application, or from Japanese patent application the applicant's share of the angle, in a pure electric vehicle battery management system sphere are the most powerful who control the vast majority of patented technology.

United States: as the world's largest car producer and consumer countries, the United States earlier carried out the research and development of electric vehicle technology. , Pure electric car battery research mainly concentrated in the lithium battery, lithium battery-related patents accounted for more than 70% of the number of patents of the power battery, followed by lead-acid batteries, nickel metal hydride batteries, air batteries, sodium batteries.

From the total amount of patent applications worldwide, as of June 2010, the United States, pure electric vehicles with battery management system patent application number is located in Japan after the second. From the United States patent applications, and pure electric vehicles with battery management system patent application, patent from Japanese applicants up to nearly 60% of the total, from the United States the applicant's application for a patent The number is smaller than in Japan.

Germany: Germany pure electric car battery research is mainly focused on the lithium battery, followed by lead-acid batteries, nickel metal hydride batteries, sodium batteries, and air battery. From the total amount of patent applications worldwide, as of June 2010, Germany's pure electric car battery management system related to the number of patent applications in the world number six very different, and ranked first in the number of Japanese patent large, only 11% of the applications in Japan.

From the German domestic patent applications and patents held by the applicant in Germany accounts for about 43% of the total, higher than the second largest in Japan. On a global scale, Germany pure electric vehicles with battery management system technology in the field of strength far less than Japan, but within the country, Germany has a strong technological advantage, patent ownership is higher than Japan.

Korea: Korean automobile production and export volume ranked fifth and fourth respectively. Korea pure electric vehicle battery research is mainly focused on the lithium battery, the patent application is much higher than the nickel-metal hydride batteries, lead acid batteries, sodium batteries. From the total amount of patent applications worldwide, Korea pure electric vehicle battery management system, the number of patent applications in Japan, the United States, China and Europe. Patent applications from South Korea, and pure electric vehicles with battery management system patent application, patent applications to apply for applicants from the South Korean national, the applicant of Japan ranked second applications only inferior to South Korea. These two countries, Korean patent applications in the field of battery management system is much higher than third in the U.S. and other countries.

China: China is focusing on improving the technical indicators for single battery electric performance, security, performance and life to a lot of research and technological, high-power nickel-metal hydride batteries, lithium ion battery performance has been greatly improved.

The total amount of patent applications worldwide, the number of patent applications in the field of battery management system in a pure electric vehicle after Japan and the United States, ranking third. From China's domestic patent applications, the number of patent applications in China has a maximum, Panasonic, Toyota, Sanyo and other well-known Japanese companies in China have a large number of high-quality patents. Domestic enterprises in China, BYD (002,594 shares) Automotive R & D capabilities in the field of electric vehicle battery technology is more prominent, with a focus on lithium-ion batteries and lithium ion polymer batteries, attaches great importance to cell structure and manufacturing methods. BYD Auto in 2003 applied for the first pure electric vehicles with batteries and its management system patents in 2003 in a pure electric vehicle battery management systems in overseas markets patent portfolio, the first overseas applicants the patent in the United States.

Intellectual property rights competition in the field of electric vehicles in the next few years, Japan will go in the forefront of thereplacement HSTNN-C17C United States, Europe and other countries.

Solution of the electric car industry is in rapid growth stage, many of the key technology is not yet mature, the United States and Europe rely on the advantage of its strong basic research, most likely made the first breakthrough in some key technologies, and re-gain a competitive advantage. Coupled with the rising star of South Korea and China's automobile industry continued to increase electric vehicle R & D investment, we can expect the competitive landscape of the future of electric vehicles will be more complicated.

A thin and light draws more power than an ultraportable

January 15 [Tue], 2013, 11:53
There are to things that will be the basis for determining how long a laptop computer should run on batteries. Of course, the overall capacity of the battery is the easiest to determine and understand. All batteries can store a fixed battery for CQ71 battery amount of energy in them. This is rated in mAh or milliampere-hours. I could go into technical details but suffice to say, the higher the mAh that a battery is rated out, the more energy that is stored in the battery.

So, why is the battery capacity important? Of two systems that use the same amount of power, the one with a higher mAh rated battery will last longer. This makes comparison easy for the batteries themselves. The problem is that no two laptop configurations will draw the same amount of power.

Power consumption of a laptop depends upon all of the components that make up the system. So, a system with a lower power consumption CPU will generally last longer if all parts are equal but they almost never are. It gets even more complicated because the power consumption can also vary depending upon how the laptop is being used. Heavy disk uses draws more power than little battery for Presario F500 usage.

All isn't lost for consumers though. In general the size of the laptop will also equate to how much power it uses. For example, a desktop replacement will generally draw more power than a thin and light. A thin and light draws more power than an ultraportable and a netbook draws even less still.

You should never recharge your battery all the way

January 15 [Tue], 2013, 11:48
Longer battery life: Every laptop user wants it, but few know how to get it without buying a new machine. Though laptop manufacturers have made great strides over the past few years in increasing the efficiency (and thus the battery for Presario CQ62 batterylife) of their products, even the most efficient modern machines don't last long enough for many users. What you may not realize, however, is that your system is probably loaded with integrated peripherals and bloatware that you'll never use but that consume resources and reduce battery life.

In this guide, we'll look at ways to reclaim those resources and maximize your laptop's battery life. Some of the steps may require venturing into the BIOS or UEFI of your notebook, while others are simpler software tweaks.

Know What Kills Your Battery
Before diving in, review why notebook batteries die in the first place. From the CPU to the trackpad, every component in a laptop consumes power. The amount consumed varies from component to component and also fluctuates in response to environmental conditions such as temperature and system workload. The greater the number of components or peripherals attached to your laptop and the more work you do with it, the quicker the battery will drain. Every program, driver, or service that loads, every background task that runs, and every electronic circuit that fires up saps a tiny bit of battery life. Consequently, reducing the number of attached or active peripherals and minimizing the load placed on the notebook will prolong battery life.

Unfortunately, some of the burdens that the manufacturer or vendor places by default on your laptop's battery may not be easy to track down and eliminate. As a result, you have to make an effort to minimize resource consumption and maximize battery life.

Try These Quick Fixes
PCWorld has posted simpler articles about how to extend your laptop battery life, and we won't cover the same items here. Keeping your laptop cool, dimming its display, and enabling system hibernation are all good ways to prolong battery life; but in this guide we'll be focusing on hard numbers that illustrate the potential benefits of certain modifications.Laptop batteries are like people--eventually and inevitably, they die. And like people, they don't obey Moore's Law--You can't expect next year's batteries to last twice as long as this year's. Battery technology may improve a bit over time (after all, there's plenty of financial incentive for better batteries), but, while interesting possibilities may pop up, don't expect major battery breakthroughs in the near future.

Although your battery will eventually die, proper care can put off the inevitable. Here's how to keep your laptop battery working for as long as possible. With luck, it could last until you need to replace that aging notebook (perhaps with a laptop having a longer battery life).
I've also included a few tips on keeping the battery going longer between charges, so you can work longer without AC power.

Don't Run It Down to Empty
Squeezing every drop of juice out of a lithium ion battery (the type used in today's laptops) strains and weakens it. Doing this once or twice won't kill the battery, but the cumulative effect of frequently emptying your battery will shorten its lifespan.

(There's actually an exception to this rule--a circumstance where you should run down the battery all the way. I'll get to that later.)

The good news: You probably can't run down the battery, anyway--at least not without going to a lot of trouble to do so. Most modern laptops are designed to shut down before the battery is empty.

In fact, Vista and Windows 7 come with a setting for just this purpose. To see it, click Start, type power, and select Power Options. Click any one of the Change plan settings links, then the Change advanced power settings link. In the resulting dialog box, scroll down to and expand the Battery option. Then expand Critical battery level. The setting will probably be about 5 percent, which is a good place to leave it.

XP has no such native setting, although your battery for Presario CQ70 battery laptop may have a vendor-supplied tool that does the same job.

Myth: You should never recharge your battery all the way.
There's considerable controversy on this point, and in researching this article I interviewed experts both for and against. But I've come down on the side of recharging all the way. The advantages of leaving home with a fully-charged battery--you can use your PC longer without AC power--are worth the slight risk of doing damage.

Regular defragmentation helps to arrange data more efficiently

January 15 [Tue], 2013, 11:46
Mobile computing has got better with lighter components, better chips and faster processors. But the Achilles heel of a laptop has remained its battery. So here are we are going to look at ways to increase laptop battery for envy Presario CQ57 battery life.

Modern graphic intensive operating systems and resource hungry applications are cutting down the life of your laptop’s battery every day. The average battery life per continuous use still stands at a maximum of three to four hours. So, a fast depleting battery could very swiftly put the crutches on your ‘mobile’ road trip.
Falling just short of carrying an extra pack of batteries in the back-pack, are several ways to keep the juice flowing through the batteries.

1. Ship shape with a defrag
Regular defragmentation helps to arrange data more efficiently thus making the hard drive work less to access the data. The quicker the moving hard drive works lesser is the load placed on the battery. Thus, your batter can last longer. The effect is minimal, but this efficiency goes hand in glove with hard drive maintenance.

2. Kill the resource gobblers
End the background processes that are not vital. Monitor the resource usage through a “?Ctrl-Alt-Del’ which brings up the Windows Task Manager (in Windows). If you’re not on the internet, it is safe to shut down the immediate non-essential programs running in the taskbar like the antivirus and the battery for Presario CQ60 batteryfirewall. Weed out unnecessary programs running as start-ups by launching the System Configuration Utility from Run ““ Msconfig ““ Tab: Startup. Uncheck the programs which you don’t want to launch and reboot the computer once.

This is the mystery battery/ultracapacitor combination that receives

November 28 [Wed], 2012, 12:42
Lead acid batteries continue to hold a leading position, especially in wheeled mobility and stationary applications. This strong market appeal entices manufacturers to explore ways to make the batteries better. Improvements have been made and some claims are so promising that one questions the trustworthiness. It is no secret that researchers prefer publishing the positive attributes while 12 cells Presario CQ50 battery keeping the negatives under wraps. The following information on lead acid developments was obtained from available printed resources at the time of writing.
Firefly Energy

The composite plate material of the Firefly Energy battery is based on a lead acid variant that is lighter, longer living and has higher active material utilization than current lead acid systems. The battery includes foam electrodes for the negative plates, which gives it a performance that is comparable to NiMH but at lower manufacturing costs. Design concerns include microtubule blockage through crystal growth during low charge conditions. In addition, crystal expansion causes a reduction of the surface area, which will result in lower capacity with aging. Pricing is also a concern. It currently costs about $450 to manufacture a Firefly battery as opposed to $150 for a regular lead acid version. Firefly Energy is a spin-off of Caterpillar and went into bankruptcy in 2010.
Altraverda Bipolar

Similar to the Firefly Energy battery, the Altraverda battery is based on lead. It uses a proprietary titanium sub-oxide ceramic structure, called Ebonex?, for the grid and an AGM separator. The un-pasted plate contains Ebonex? particles in a polymer matrix that holds a thin lead alloy foil on the external surfaces. With 50–60Wh/kg, the specific energy is about one-third larger than regular lead acid and is comparable with NiCd. Based in the UK, Altraverda works with East Penn in the USA, and the battery is well suited for higher voltage applications.
Axion Power

The Axion Power e3 Supercell is a hybrid battery/ultracapacitor in which the positive electrode consists of standard lead dioxide and the negative electrode is activated carbon, while maintaining an assembly process that is similar to lead acid. The Axion Power battery offers faster recharge times and longer cycle life on repeated deep discharges than what is possible with regular lead acid systems. This opens the door for the start-stop application in micro-hybrid cars. The lead-carbon combination of the Axion Power battery lowers the lead content on the negative plate, which results in a weight reduction of 30 percent compared to a regular lead acid. This, however, also lowers the specific energy to 15–25Wh/kg instead of 30–50Wh/kg, which a regular lead acid battery normally provides.
CSIRO Ultrabattery

The CSIRO Ultrabattery combines an asymmetric ultracapacitor and a lead acid battery in each cell. The capacitor enhances the power and lifetime of the battery by acting as a buffer during charging and discharging, prolonging the lifetime by a factor of four over customary lead acid systems and producing 50 percent more power. The manufacturer also claims that the battery is 70 percent cheaper to produce than current hybrid electric vehicle (HEV) batteries. CSIRO batteries are undergoing road trials in a Honda Insight HEV and show good results. Furukawa Battery in Japan licensed the technology. The CSIRO battery is also being tested for start-stop applications in micro-hybrid cars to replace the lead acid starter battery. This battery promises extended life when exposed to frequent start-stop conditions and is able to take a fast charge.
EEStor

This is the mystery battery/ultracapacitor combination that receives much media attention. The battery is based on a modified barium titanate ceramic powder and claims a specific energy of up to 280Wh/kg, higher than lithium-ion. The company is very secretive about their invention and releases only limited information. Some of their astonishing claims are: One-tenth of the weight of a NiMHcheap Presario CQ56 batteryin a hybrid application, no deep-cycle wear-down, three- to six-minute charge time, no hazardous material, similar manufacturing costs to lead acid, and a self-discharge that is only 0.02 percent per month, a fraction of that of lead acid and Li-ion.

The lead acid battery is the preferred choice for hospital equipment

November 28 [Wed], 2012, 12:41
We often get puzzled by announcements of new batteries that are said to offer very high energy densities, deliver 1000 charge/discharge cycle and are paper-thin. Are they real? Perhaps — but not in one and the same high quality Presario CQ43 battery . While one battery type may be designed for small size and long runtime, this pack will not last and wear out prematurely. Another battery may be built for long life, but the size is big and bulky. A third battery may provide all the desirable attributes, but the price would be too high for commercial use.

Battery manufacturers are well aware of customer needs and have responded by offering packs that best suit the specific applications. The mobile phone industry is an example of clever adaptation. Emphasis is placed on small size, high energy density and low price. Longevity comes in second.

The inscription of NiMH on a battery pack does not automatically guarantee high energy density. A prismatic Nickel-Metal Hydride battery for a mobile phone, for example, is made for slim geometry. Such a pack provides an energy density of about 60Wh/kg and the cycle count is around 300. In comparison, a cylindrical NiMH offers energy densities of 80Wh/kg and higher. Still, the cycle count of this battery is moderate to low. High durability NiMH batteries, which endure 1000 discharges, are commonly packaged in bulky cylindrical cells. The energy density of these cells is a modest 70Wh/kg.

Compromises also exist on lithium-based batteries. Li?ion packs are being produced for defense applications that far exceed the energy density of the commercial equivalent. Unfortunately, these super-high capacity Li?ion batteries are deemed unsafe in the hands of the public and the high price puts them out of reach of the commercial market.

In this article we look at the advantages and limitations of the commercial battery. The so-called miracle battery that merely live in controlled environments is excluded. We scrutinize the batteries not only in terms of energy density but also longevity, load characteristics, maintenance requirements, self-discharge and operational costs. Since NiCd remains a standard against which other batteries are compared, we evaluate alternative chemistries against this classic battery type.
Nickel Cadmium (NiCd) — mature and well understood but relatively low in energy density. The NiCd is used where long life, high discharge rate and economical price are important. Main applications are two-way radios, biomedical equipment, professional video cameras and power tools. The NiCd contains toxic metals and is environmentally unfriendly.

Nickel-Metal Hydride (NiMH) — has a higher energy density compared to the NiCd at the expense of reduced cycle life. NiMH contains no toxic metals. Applications include mobile phones and laptop computers.

Lead Acid — most economical for larger power applications where weight is of little concern. The lead acid battery is the preferred choice for hospital equipment, wheelchairs, emergency lighting and UPS systems.

Lithium Ion (Li?ion) — fastest growing battery system. Li?ion is used where high-energy density and lightweight is of prime importance. The technology is fragile and a protection circuit is required to assure safety. Applications include notebook computers and cellular phones.
Lithium Ion Polymer (Li?ion polymer) — offers the attributes of the Li-ion in ultra-slim geometry and simplified packaging. Main applications 9cells Presario CQ45 batteryare mobile phones.

Figure 1 compares the characteristics of the six most commonly used rechargeable battery systems in terms of energy density, cycle life, exercise requirements and cost. The figures are based on average ratings of commercially available batteries at the time of publication.

The problem stems from low battery currents

October 10 [Wed], 2012, 16:15
Alkaline batteries have long shelf lives and they do not suffer the 'memory effects' of Nickel-cadmium batteries. The term 'Memory effects' refers to the batteries becoming weaker with continued use, particularly when the original Pavilion dm1 battery have seen light use and do not respond well to further charging.

The problem stems from low battery currents which flow from only a small part of the active anode area of the battery. If higher current had been drawn or if the battery had been completely discharged, the whole active area of the anode would have been involved. The unused area essentially 'films over' and acts as a barrier to current flow. Further charging does not restore the active area.

Alkaline batteries do not self-discharge. This is a chemical change causing the electrodes to degenerate in Nickel-metal hydride and Nickel-cadmium hp Pavilion envy 17 battery. It is reversible by charging and discharging several times. Batteries that are not recharged before use will not supply the full amount of stored energy.

None of the above happens with common Alkaline batteries. The rate of self discharge in Nickel-cadmium is about 2% per week, in Nickel-metal hydride it is about 3% per week. At temperatures higher than room temperature, these rates increase.

The amount of energy stored in a given battery depends

October 10 [Wed], 2012, 16:12
Summed up in one word, the answer is weight. Those who design these devices are faced with difficult decisions. How can we make the device have long operating time, yet keep the weight down? A bigger battery will contain more energy to make it last longer, but will the market stand for the added weight? What is our competition doing? If the competition has switched to a more exotic type ofreplacement 580029-001, Lithium-ion or Nickel-metal Hydride, then they are forcing the customer to use more expensive replacement batteries, which may not be easily replaced.

A specially-designed charger would have to be included with the product for these specialty batteries, and that drives up the selling price of the product even more. And these chargers are not usually interchangeable with any chargers the customer may already have.

The power supplied by the batteries to your digital camera, your MP3 player, or your radio, multiplied by the time the power flows, equals a certain number of Watt-hours. Are you familiar with the electric utility meter on your house or apartment that registers the number of Kilowatt-hours you and your family use?

The utility then bills you for the quantity of energy (kilowatt-hours) that you use. Batteries don't store power, they store energy. Did you know that? When you buy a battery you are paying for the energy it contains, and at a premium price if the technology behind the battery is new and therefore it is lighter than expected.

The amount of energy stored in a given battery depends, not only upon its weight and volume, but upon the materials and construction of the battery. For instance, you can count on any brand of alkaline battery to have within it about 4 times the energy of the old-fashioned carbon-zinc battery.

Those carbon-zinc batteries are still around in packages labeled "heavy duty" or "transistor power". (Beware when you are buying batteries -- look for the word "alkaline" on the package.)

In high-drain applications such as toys, cameras, and CD players, carbon-zinc batteries will not be able to provide that one-quarter energy of alkaline batteries of similar size. They will yield only a little more than a 12 cells Pavilion g56 batteryquarter of that quarter, or roughly 10% of the alkaline's energy.

This figure is frequently quoted when comparisons are made in battery commercials on TV. "This new improved battery lasts 10 times longer than ordinary batteries." Guess what kind of ordinary battery they are comparing it to!