Daily Archives: July 17, 2013

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.