Battery Types

There are, in general, two types of batteries: primary batteries, and secondary storage or accumulator batteries. Primary types, although sometimes consisting of the same active materials as secondary types, are constructed so that only one continuous or intermittent discharge can be obtained. Secondary batteries are constructed so that they may be recharged, following a partial or complete discharge, by the flow of direct current through them in a direction opposite to the current flow on discharge. By recharging after discharge, a higher state of oxidation is created at the positive plate or electrode and a lower state at the negative plate, returning the plates to approximately their original charged condition.

What is the best battery?

What is the best battery? Many people want to know the answer. Below is a summary of the strength and limitations of today's popular battery systems. Although energy density is paramount, other important attributes are service life, load characteristics, maintenance requirements, self-discharge costs and safety. Nickel-cadmium is the first rechargeable battery in small format and forms a standard against which other chemistry are commonly compared. The trend is towards lithium-based systems.

Nickel-cadmium- mature but has moderate energy density. Nickel-cadmium is used where long life, high discharge rate and extended temperature range is important. Main applications are two-way radios, biomedical equipment and power tools. Nickel-cadmium contains toxic metals.

Nickel-metal-hydride- has a higher energy density compared to nickel-cadmium at the expense of reduced cycle life. There are no toxic metals. Applications include mobile phones and laptop computers. NiMH is viewed as steppingstone to lithium-based systems.

Lead-acid- most economical for larger power applications where weight is of little concern. Lead-acid is the preferred choice for hospital equipment, wheelchairs, emergency lighting and UPS systems. Lead acid is inexpensive and rugged. It serves a unique niche that would be hard to replace with other systems.

Lithium-ion- fastest growing battery system; offers high-energy density and low weight. Protection circuit are needed to limit voltage and current for safety reasons. Applications include notebook computers and cell phones. High current versions are available for power tools and medical devices.

What is a Battery?

"A battery can be any device that stores energy for later use. The word battery is limited to an electrochemical device that converts chemical energy into electricity, by use of a galvanic cell. A galvanic cell is a fairly simple device consisting of two electrodes and an electrolyte solution. Batteries consist of one or more galvanic cells. "

"A battery is an electrical storage device. Batteries do not make electricity, they store it. As chemicals in the battery change, electrical energy is stored or released. In rechargeable batteries this process can be repeated many times. Batteries are not 100% efficient - some energy is lost as heat and chemical reactions when charging and discharging. If you use 1000 watts from a battery, it might take 1200 watts or more to fully recharge it. Slower charging and discharging rates are more efficient. A battery rated at 180 amp-hours over 6 hours might be rated at 220 AH at the 20-hour rate, and 260 AH at the 48-hour rate. Typical efficiency in a lead-acid battery is 85-95%, in alkaline and NiCad battery it is about 65%."

Exam or ability

Nowadays when the graduated students set foot in society, they may face a big challenge in hunting a job. A large number of them may go to interviews with all certification. Although many people say that ability is more important than any kinds of certification, many companies will give the interview chance to the one who has more certification.

In my mind, the certification can not represent one’s ability in knowledge but the exam.

Now many students may try to pass a variety of exams in different areas that may help them in choosing jobs. Even if they have already passed the exam, they may not know it clearly. Some of them even totally lack of knowledge. On the opposite, some students know much more about it and have an ability to apply the knowledge, but they didn’t pass the exam.

Exam or ability, certification or ability, which will you choose?

laptop battery

When I was Fair and Young

--- Queen Elizabeth I

When I was fair and young, and favour graced me,

Of many was I sought, their mistress for to be;

But I did scorn them all, and answered them therefore:

"Go, go, go seek some otherwhere; importune me no more!"

How many weeping eyes I made to pine with woe,

How many sighing hearts, I have no skill to show;

Yet I the prouder grew, and answered them therefore:

"Go, go, go seek some otherwhere; importune me no more!"

Then spake fair Venus' son, that proud victorious boy,

And said: "Fine dame, since that you be so coy,

I will so pluck your plumes that you shall say no more:

'Go, go, go seek some otherwhere; importune me no more!'"

When he had spake these words, such change grew in my breast

That neither night nor day since that, I could take any rest.

Then lo! I did repent that I had said before:

"Go, go, go seek some otherwhere; importune me no more!"

laptop battery

AGM Absorbed Glass Mat Battery

Also known as Absorptive Glass Micro-Fibre

Its purpose is to promote recombination of the hydrogen and oxygen given off during the charging process. No silica gel is necessary. The fibreglass matt absorbs and immobilises the acid in the matt but keeps it in a liquid rather than a gel form. In this way the acid is more readily available to the plates allowing faster reactions between the acid and the plate material allowing higher charge/discharge rates as well as deep cycling.

This construction is very robust and able to withstand severe shock and vibration and the cells will not leak even if the case is cracked.

AGM batteries are also sometimes called "starved electrolyte" or "dry", because the fibreglass mat is only 95% saturated with Sulfuric acid and there is no excess liquid.

Nearly all AGM batteries are sealed valve regulated "VRLA".

This is an alternative recombinant technology to also used in VRLA batteries to promote recombination of the gases produced during charging. It also reduces the possibility of spillage of the electrolyte. Prone to damage if gassing is allowed to occur, hence charging rates may be limited. They must be charged at a slower rate (C/20) to prevent excess gas from damaging the cells. They cannot be fast charged on a conventional automotive charger or they may be permanently damaged.

SLI Batteries

This is the typical automotive battery application. Automotive batteries are designed to be fully charged when starting the car; after starting the vehicle, the lost charge, typically 2% to 5% of the charge, is replaced by the alternator and the battery remains fully charged. These batteries are not designed to be discharged below 50% Depth of Discharge (DOD) and discharging below these levels can damage the plates and shorten battery life.

Deep Cycle Batteries

Marine applications, golf buggies, fork lift trucks and electric vehicles use deep cycle batteries which are designed to be completely discharged before recharging. Because charging causes excessive heat which can warp the plates, thicker and stronger or solid plate grids are used for deep cycling applications. Normal automotive batteries are not designed for repeated deep cycling and use thinner plates with a greater surface area to achieve high current carrying capacity.

Valve Regulated Lead Acid (VRLA) Batteries

It is also called Sealed Lead Acid (SLA) batteries.

This construction is designed to prevent electrolyte loss through evaporation, spillage and gassing and this in turn prolongs the life of the battery and eases maintenance. Instead of simple vent caps on the cells to let gas escape, VRLA have pressure valves that open only under extreme conditions. Valve-regulated batteries also need an electrolyte design that reduces gassing by impeding the release to the atmosphere of the oxygen and hydrogen generated by the galvanic action of the battery during charging. This usually involves a catalyst that causes the hydrogen and oxygen to recombine into water and is called a recombinant system. Because spillage of the acid electrolyte is eliminated the batteries are also safer.

Lead Acid Batteries

Lead acid batteries were invented in 1859 by Gaston Planté and first demonstrated to the French Academy of Sciences in 1860. They remain the technology of choice for automotive SLI (Starting, Lighting and Ignition) applications because they are robust, tolerant to abuse, tried and tested and because of their low cost. For higher power applications with intermittent loads however, Lead acid batteries are generally too big and heavy and they suffer from a shorter cycle life and typical usable power down to only 50% Depth of Discharge (DOD). Despite these shortcomings Lead acid batteries are still being specified for PowerNet applications (36 Volts 2 kWh capacity) because of the cost, but this is probably the limit of their applicability and NiMH and Li-Ion batteries are making inroads into this market. For higher voltages and cyclic loads other technologies are being explored.

Lead-acid batteries are composed of a Lead-dioxide cathode, a sponge metallic Lead anode and a Sulphuric acid solution electrolyte. This heavy metal element makes them toxic and improper disposal can be hazardous to the environment.

How to prolong the life of your laptop battery

When we buy a laptop, including the main features that we are going to look at is its autonomy.

The batteries such as Dell Vostro 1510 replacement battery, however, have made great strides, we moved from the old nickel cadmium batteries, lithium-ion suffering a lot less memory effect due to the crystallization of.

As I mentioned above, now all laptop Dell Latitude D810 replacement batteries are made with Lithium or better Li-ion, but they, like all the rest, a life quite limited, the average is about 600-900 charge cycles. Within the battery of small accumulators are very similar to ordinary batteries.

When you turn on your laptop, do not ever discharge the battery for example your Dell latitude D610 battery on laptop completely, and when to see the remaining charge is about 5%, turn off the laptop and recharge. Remember the Li-ion batteries should never be completely discharged otherwise their durability is reduced.

If you do not need, do not use your Dell latitude E5500 battery on laptop, detach from your laptop and connect it directly all'alimentarore. Avoid, especially, and attack off the power supply with battery inserted.

If over time you notice a significant reduction of autonomy, this is nothing but a sign of the end of battery life.

To be or not to be 2

“To be or not to be, that is a question.” Now the sentence has been used in many occasions and by many people when they should make a choice. Love or marriage is always the main item for a large number of people. However what is the standard to choose a lover is hard for people to decide.

In the real situation, all the parents want their children to live an easy life, so they may have high expectation for it. Love or wealthy, that is a question. I think all people want to seek for the one that both of them can have true love and live together forever. However some people also think that if the one even can not afford what a family needs, how they can talk about love. Now many people struggle in the problem.

Love or wealthy, that is a question.

laptop battery

To be or not to be 1

“To be or not to be, that is a question.” The words are said by Hamlet. It is hard for him to make a choice. However in our life, we should always face some choices. Some of them may be easy, while others may be difficult for us. So what we should do is to know what we really concern.

Now many young people face 2 big problems. The first one is the job, the other is love or marriage.

What kind of job should we prefer? I think the question has no answer. It depends on the individual character. Some people like full-challenging in the life, so they want to do something passionate. Others may like the steady life, so they prefer to become teachers, officers and so on. But no matter how to make a choice, you should find your position in the society. We can be confused for some time, but we can’t always be confused.

To be or not to be, that is a question. Challenging or steady, that is a question. Find what you want, you will be access to your dream life quickly.

laptop battery

Choose the right one, protect the right one

When we choose the laptop battery, we all want it to be used as long as possible. In fact, how to use the laptop battery is also a problem. Some incorrect ways always short the life of your battery.

Maybe some people have their idea on how to use it, we will still share some tips here.

When we buy a new laptop battery, we should charge/discharge it totally 3 times to active it. If we will not use it for a long time, we should restore it with 30-40% energy instead of full energy.

When we use the laptop with AC, we should keep the laptop battery out of it, which can protect the battery.

When we use the notebook with the laptop battery, we should keep the temperature in a normal level. If the temperature is too high, it will have bad effect on the battery and laptop itself.

Where to buy a battery

If early predictions are any indication, the Acer aspire 5000 laptop battery is already a BlockBuster, with analyst estimates ranging from 500,000 to one million units sold over the weekend. Translation: Good luck trying to find a laptop battery. Lucky for you, we here at LAPTOP with the battery did our home work and we’re happy to report that not all hope is lost if you want to get your mitts on it.

As one of the World’s largest retail chains, surely they can manage to round up a few laptop right? A quick call to a Brooklyn based Target yielded some results. According to the sales rep, they do indeed have a new shipment of Apple Powerbook G4 17 inch laptop battery in stock, but he wouldn’t say which models and made the point that customers would need to explicitly ask for a battery as they will not be displaying them out on the floor.

How is your holiday like?

Everyone wants a long time holiday after a long time work. Before the holiday, many people may make a good plan and want to make it meaningful. However when the holiday is coming, some people may look sleeping as the first choice. And they also like it.

Some people will have a travel with their family or friends. They appreciate the beautiful scenery and delicious food in different places. It can bring them much more different experiences, which will stay along with them.

In fact no matter what activities you choose during the holiday, a good rest is necessity. Our bodies just like the laptop battery. After a long time work, all of us will feel tired and exhausted. The long holiday is a good time for us to have a good rest and recharge ourselves. It can bring more energy for us.

How is your holiday like? Have you had a good rest during it?