Category Archives: laptop battery

laptop battery

How to choose a dell xps m1530 battery

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Laptop batteries for notebook computers is very important, laptop batteries have a direct impact on laptop.Every laptop company has different batteries, and many laptop companies have different batteries for different models. So how to figure out which is yours dell xps m1530 battery? Well, you could buy it directly from the company, which means you’ll probably pay a serious premium (Dell, for example, has been known to charge four times more than ones you can get elsewhere). Unless you have to, why pay more?

Instructions
1.Obtain the model number of the replacement laptop battery you need. If you’re simply replacing a battery, just look at your old one, and it should be there. If not, log onto the manufacturer’s website and look up your model, then its accessories. Find the battery you need, and make a note of the model number.
2.Establish which laptop battery you want, if you have options. Some laptops have extended life batteries, and some have batteries that charge quicker than others, both of which cost more than your garden variety battery. You can determine what is available to you by (again) visiting the manufacturer’s website. If more than one battery is available, it will tell you. You might want a longer-life battery if you spend a lot of time “off-cord,” or working on planes or in airport terminals. Quick-charging laptop batteries tend to be a luxury, however, some laptops won’t fully charge without several hours of charging; take that into consideration when deciding which to purchase.
3.Set the market. When you visit the manufacturer’s website, note the prices for the batteries. This will establish the high-end of what you might have to pay, and allow you to compare. Take note of the model numbers for each of the dell laptop batteries you might be deciding between, since you will want to make sure that you get exactly the one you want, and not a knock-off.
4.Comparison shop to determine who has the lowest prices. Buyer beware, however..there are a lot of small electronic websites that promise one thing and then send you the Japanese version of the laptop battery, which may or may not work for your computer. If it looks too good to be true, it probably is.
5.Compare the prices to the price of the manufacturer. If it’s close, go with the manufacturer, since you know for sure that whatever it sends you will be the perfect thing for your computer. Keep in mind that there is a slight, but very real, chance that loading the wrong dell xps m1530 battery into your computer will damage or even completely wreck your laptop .

laptop battery

Selectively choose dell d800 battery

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Nowadays, we all see that laptops are fashionable and popular among persons for its portability. Only when you make sure your laptop battery is stable, can you get full use of it. But if you can not, you need to replace it by another. So how to choose laptop battery is very important. But not everyone know how to choose form them and many persons are puzzled. Now let me show you some tips to help you pick dell d800 battery.

Firstly, you should concentrate on is the types of the laptop battery. Lithium ion battery is the most popular and normal battery on the market. Nickel metal hydride battery is better than nickel cadmium battery, but less popular than lithium ion battery. And now it is difficult to see nickel cadmium battery in our daily life. So we can draw a conclusion there are three types of laptop batteries. If you want to buy a battery of high quality, you should understand the types to certain degree.
Secondly, it is necessary to take the standard of battery in to consideration. The best way is to buy batteries made by the manufacturer of your laptop from a lot of manufacturers of laptop battery on the market. At the same time, these are more expensive than other batteries made by other manufactures. So you can also choose other batteries if you do not have enough money.
Thirdly, as it is known to all, batteries are often measured by Volts and Amperes. And they can decide the battery rating. Sometimes, the batteries in same size have different battery ratings. The rating is a extreme important factor to weight the battery. At the same time, a dozen of manufactures tell others the rating of battery with Volts and Milliamperes. It is difficult for us to decide which one to choose when they are different in both Volts and Milliamperes. In this condition, it has to depend on Watt-Hours which is the coalition of both the Volts and the Amperes. This way can help you compare the batteries with the Dell battery.
The last thing you should notice is the refurbished batteries. Because they have less power and the laptop battery life is shorter than the new one. So you must think carefully when you face this condition.
There are some tips to help you make a wisdom decision and pick a better dell d800 battery. Do you agree with me? The answer may be no. It is possible that there are some other ways that should be taken into consider. But I still hope that what I show you can give you a hand to a certain degree.

laptop battery

Why dell latitude e6400 battery explode?

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Laptop battery is composing of enclosure, interface, cell and control circuit board, battery cell is responsible for supplying and storing the power of the laptop. Control circuit board with complex working principle and design, it controls the battery start and stop charging at proper time, control the discharge current reasonable, and it also take charge of showing the battery capacity and recycle charge times recording. When the battery in a high temperature or large current and other un-normal condition, it the control circuit board can protect the dell latitude e6400 battery.

With regard to electricity, we will sometimes see the makers advertising their merchandise with all the amount of core and mA to indicate the battery degree, above time we are going to really feel that the higher of mA number, the longer functioning time. The reality is, we made use of the nominal energy to find out the indicators of laptop energy usage. Battery power is voltage multiplied by existing to have. For your similar mAh battery, the imperative is it is quantity of batteries and hybrid technique, this kind of as 2 and four strings of 8-cell hybrid mode, it will over two and two strings of 4 core hybrid electrical power. Even so, the grow within the amount of batteries will subsequently bring about the fat escalating of laptop batteries, consumers should spend consideration.

The four suspicion of laptop battery explosion.

A, Battery cells interior short-circuit

The battery cells has no protection function when meet large current, if single or multiple cells happen short-circuit situation, it will let cells discharge at high current. These current generate large quantity of heats will let the battery enhance the temperature, and then transfer to the other parts of laptop.

If the Latitude e6400 battery enclosure is plastic material, it will deform or even get fired under high temperature, it is dangerous. The regular cells has experience strict test when out from factory, and the battery enclosure always adopt fireproof material and difficult to get fire.

B, Battery cells connector wire short-circuit

The Dell Battery, interior structure is too compact which leave opportunity for the cells. The wires in the middle are quite compact and close to the cells, if the skin of the cells and wires wore out, or the connect wires break off, then the cells will discharge at very high current and bring high temperature and cause fire final.

C, The control circuit invalidation

Sometimes, the control circuit will be invalidate for its protection part even it performed normal when use Latitude e6400, when under full charge and un-normal, large current situation, the temperature will enhance and cause fire.

D, Heat and abrupt incident

The laptop over heat or exterior liquid corrode, lightning strike or voltage un-normal will cause dell latitude e6400 battery short-circuit.

laptop battery

The eight wrong ways to protect a dell mini 10 battery

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The first wrong way:The new laptop battery should charge for three times after brought home.

Unless you brought the laptop battery is more than one year of product inventory ,otherwise , don’t do like this.Beacuse it had alread been activated in the factory .When you got the laptop battery , It has been activated .And it’s no need to do the same thing.

The second wrong way:We should charge more then 12 hours for it in the first time.

This early who do not have the dell mini 10 battery control circuit of the nickel-metal hydride battery model is applicable, but now with intelligent charge and discharge control circuit for notebook battery is a joke, when the laptop battery is fully charged, the charging current will be automatically cut off , even if you continue to charge 120 hours, the state would not be any change, in general, even the slowest machine charge, 6 hours is completely filled, the rest of the “charge” is just a waste of their time. Proper use of power is plugged in properly without the need of full or discharge to no power off.

The third wrong way:The laptop battery requires periodic calibration and complete charge and discharge once a month .

For the strong memory effect nickel-metal hydride battery which is a necessary way.but it’s too frequently to a lithium battery. If you use the laptop battery frequently ,you had better discharge it to a relatively low (about 10 ~ 15%) to recharge.If you rarely use the battery, you can only do like this every 3 month.

The forth wrong way:correction can improve the battery capacity

The so-called correction, when the battery’s actual capacity and the control circuit when the record is not the same capacity, the battery charge and discharge operation of a depth so that the control circuit record, bringing them closer to the actual situation of the battery, which is a manifestation of the true capacity of the battery operation rather than enhance the capacity factor here is the actual battery capacity, if the actual battery capacity than the capacity of the control circuit to a record high, the correction can make the battery appear to increase the capacity, if the battery’s actual capacity than the control circuit the capacity to record low, the correction will reduce the battery capacity looks, which is why many people are debating the reasons for correction effect, remember that the true correction is to make the battery capacity is presented, eliminating between battery and control circuit bias, as demonstrated by the capacity will increase or decrease, this is the state of the laptop battery itself, rather than determined by your correction. Correction is likely because the battery discharge when the depth of the damage, but greatly reduced capacity.

The fifth wrong way :We can use the compatible battery

Notebook power consumption is much larger than mobile phones, the most extreme circumstances, the power required to charge the battery while the machine running at full speed and to cope with the required power supply, generally do not have compatible laptop charger, because the various models of voltage, current, or even interfaces are different, can be common in a variety of notebook “compatible charger” is likely more expensive than the original charger, even if the same interface, if the voltage and current is lower than the nominal value of the machine, the machine working at full speed when the battery may not be able to obtain sufficient charge current, which is a great damage to the battery.

The sixth wrong way:battery needs to be charged (or put photovoltaic) to save

Whether it is full or shine, they are actually not correct, put long-term preservation photoelectric batteries will lose their activity, and even lead to the control circuit protection self-locking and can no longer use the full power of long-term preservation will bring security risks, the best method of preservation is to discharge to 40% and then save, lithium fear humidity and high temperatures, so should be placed in a cool dry place, but the temperature is not too low, otherwise the capacity will be greatly reduced, about 20 degrees Celsius is the ideal storage the temperature.

The seventh wrong way:We can change the battery core with ourselves

Many of us can’t do this in a right way .And we should let somebody else who know it to help us do it.

The eight wrong way:We should not charge it to 100%

It’s common for us to charge it don’t reach 100%,and if we still charge it ,it will explode,there is no need to worry about it .

No matter how carefully you protect the dell mini 10 battery ,it will die .And the laptop battery will die with the time passing by.so the laptop battery can last about 1 year in common.

laptop battery

How long of laptop battery runtime

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The laptop battery runtime is governed by other attributes than the specified capacity alone.

This paper examines the cause of unexpected downtime and short laptop battery service life. We look at four renegades – declining capacity, increasing internal resistance, elevated self-discharge and premature voltage cut-off on discharge. We evaluate how these regenerative deficiencies affect nickel, lead and lithium-based batteries.

Declining capacity
The amount of charge a battery can hold gradually decreases due to usage and aging. Specified to deliver 100% capacity when new, the laptop battery should be replaced when the capacity drops to below 80% of the nominal rating. Some organizations may use different end-capacities as a minimal acceptable performance threshold.

The energy storage of a battery can be divided into three imaginary sections consisting of: available energy, the empty zone that can be refilled, and the unusable part (rock content) that increases with aging.

In nickel-based batteries, the so-called rock content is present in form of crystalline formation, also known as memory. Restoration is possible with a full discharge to one volt per cell. However, if no service is done for four months and longer, a full repair becomes increasingly more difficult the longer service is withheld. To prevent memory, nickel-based batteries should be deep-cycled once every one or two months. Nickel-cadmium and nickel-metal-hydride batteries are used for two-way radios, medical instruments and power tools.

Performance degradation of the lead-acid battery is caused by sulfation and grid corrosion. Sulfation is a thin layer that forms on the negative cell plate if the laptop battery is being denied a fully saturated charge. Sulfation can, in part, be corrected with cycling and/or topping charge. The grid corrosion, which occurs on the positive plate, is caused by over-charge. Lead-acid batteries are used for larger portable devices and wheeled applications.

Lithium-ion batteries lose capacity through cell oxidation, a process that occurs naturally during use and aging. The typical life span of lithium-ion is 2-3 years under normal use. Cool storage a 40% charge minimizes aging. An aged lithium-ion cannot be restored with cycling. Lithium-ion is found in cell phones and mobile computing.

Increasing internal Resistance
The capacity of a laptop battery defines the stored energy – the internal resistance governs how much energy can be delivered at any given time. While a good laptop battery is able to provide high current on demand, the voltage of a laptop battery with elevated resistance collapses under a heavy load. Although the laptop battery may hold sufficient capacity, the resulting voltage drop triggers the ‘low battery’ indicator and the equipment stops functioning. Heating the laptop battery will momentarily increase the output by lowering the resistance.

A laptop battery with high internal resistance may still perform adequately on a low current appliance such as a flashlight, portable CD player or wall clock. Digital equipment, on the other hand, draw heavy current bursts.

Nickel-cadmium offers very low internal resistance and delivers high current on demand. In comparison, nickel-metal-hydride starts with a slightly higher resistance and the readings increase rapidly after 300 to 400 cycles.

Lithium-ion has a slightly higher internal resistance than nickel-based batteries. The cobalt system tends to increase the internal resistance as part of aging whereas the manganese (spinel) maintains the resistance throughout its life but loses capacity through chemical reaction. Cobalt and manganese are used for the positive electrodes.

High internal resistance will eventually render the laptop battery useless. The energy may still be present but can no longer be delivered. This condition is permanent and cannot be reversed with cycling. Cool storage at a partial state-of-charged (40%) retards the aging process.

The internal resistance of Lead-acid batteries is very low. The battery responds well to short current bursts but has difficulty providing a high, sustained load. Over time, the internal resistance increases through sulfation and grid corrosion.

Elevated self-discharge

All batteries suffer from self-discharge, of which nickel-based batteries are among the highest. The loss is asymptotical, meaning that the self-discharge is highest right after charge and then levels off. nickel-based batteries lose 10% to 15% of their capacity in the first 24 hours after charge, then 10% to 15% per month afterwards. One of the best batteries in terms of self-discharge is Lead-acid; it only self-discharges 5% per month. Unfortunately, this chemistry has the lowest energy density and is ill suited for portable applications.
lithium-ion self-discharges about 5% in the first 24 hours and 1-2% afterwards. Adding the protection circuit increases the discharge by another 3% per month. The protection circuit assures that the voltage and current on each cell does not exceed a safe limit.

The self-discharge on all battery chemistries increase at higher temperatures. Typically, the rate doubles with every 10°C (18°F). A noticeable energy loss occurs if a battery is left in a hot vehicle.

Aging and usage also affect self-discharge. nickel-metal-hydride is good for 300-400 cycles, whereas nickel-cadmium may last over 1000 cycles before high self-discharge affects the performance. An older nickel-based battery may lose its energy during the day through self-discharge rather than actual use. Discard a battery if the self-discharge reaches 30% in 24 hours.

Nothing can be done to reverse this deficiency. Factors that accelerate self-discharge are damaged separators induced by crystalline formation, allowing the packs to cook while charging, and high cycle count, which promotes swelling in the cell. Lead and lithium-based batteries do not increase the self-discharge with use in the same manner as their nickel-based cousins do.

Premature voltage cut-off
Not all stored laptop battery power can be fully utilized. Some equipment cuts off before the designated end-of-discharge voltage is reached and precious battery energy remains unused. Applications demanding high current bursts push the battery voltage to an early cut-off. This is especially visible on laptop batteries with elevated internal resistance. The voltage recovers when the load is removed and the battery appears normal. Discharging such a battery on a moderate load with a battery analyzer to the respective end-of-discharge threshold will sometimes produce residual capacity readings of 30% and higher, jet the battery is inoperable in the equipment. Figure 4 illustrates high cut-off voltage.

High internal  laptop battery resistance and the equipment itself are not the only cause of premature voltage cut-off – warm temperature also plays a role by lowering the laptop battery voltage. Other reasons are shorted cells in a multi-cell battery pack and memory on nickel-based batteries.

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Dell Latitude D620 Laptop Battery Review

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The Latitude D620 is equipped with the latest Intel®  Centrino®  Duo Mobile Technology: an available dual-core Intel®  Core™2 Duo processor, choice of Intel 945 GM or 945 PM chipset and Intel PRO/Wireless 3945 Wi-Fi®  mini-card. These components ensure to get the best possible mobile performance while using less battery power than previous-generation technologies. Choose a 6- or 9-cell battery and take advantage of the power savings features of Centrino®  Mobile Technology to stay productive longer. Plus, you can quickly and easily customize your power settings with Dell QuicksetTM  software.

Sunvalleyus Dell Latitude D620 batteries and chargers come with 6 months warranty and 100% compatibility guarantee. Physically, this item is nearly identical to the Dell branded battery. There are no quality issues at all. It does have the battery meter on the bottom, just like the original one. This high capacity rechargeable battery definitely disposes of more power than the original rechargeable battery included in delivery of the unit. This rechargeable battery can be used instead of the original rechargeable battery without any problems and can be recharged with the available standard power supply. The rechargeable battery is protected and secured against overcharge and short-circuits.

Features of   Dell Latitude D620 battery :


Voltage: 11.1V
Capacity: 4400mAh
Type: Li-ion
Number of cells: 6
UL certificated cells inside!
100% OEM compatible, guaranteed to meet or exceed OEM specifications!

Does your Dell Latitude D620 battery seem to only last an hour when you use it? Promises of 6-8 hour battery life spans were calculated under ideal circumstances. However, the average user is much more demanding on their laptop. So how to increase and extend your laptop battery life?
There is always a guide for the step ahead:

Step 1 Eliminate any extra programs running in the background. Although these applications can’t be seen, they are still using energy to run.

Step 2 Dim your screen to the lowest level tolerable. A bright screen uses a significant amount of power.

Step 3 Avoid leaving CD’s or DVD’s in your drives. When you start your computer up these disks take up valuable power being read and loaded. Every tiny bit of power counts.

Step 4 Keep your Dell Latitude D620 battery connections clean. Dirty or corroded contacts can drain power even when your laptop isn’t currently on.

Step 5 Add more RAM to your laptop. This will help you use “”real memory”” instead or virtual memory. Virtual memory uses more hard drive and energy space. Adding additional RAM can be expensive, but is a great way to extend the battery life of your laptop.

Sunvalleyus strives to make your computer battery purchase easy. Since finding the right batteries for your needs can be overwhelming and confusing at times, it has developed a laptop battery search tool to help find the right size for the make and model of your equipment. It also offers educational articles and tips to help you conserve your laptop batteries and fix common problems. All in all, buying a cheap replacement like this is worth saving money on dell’s prices.