Laptop batteries for the construction and the principle of batteries

1, laptop batteries Category:

Media can be divided in accordance with nickel-cadmium battery NI-CD, Ni-MH NI-MH, Lithium-Ion battery LI, lithium-ion LI-ION and the latest lithium-ion polymer battery, and now the IBM THINKPAD R40 Laptop Battery used is the notebook lithium-ion batteries.

2, the structure and capacity of laptop battery calculated as follows:

No matter what kind of notebook batteries by batteries + charging protection circuit, the charging protection circuit is again the control chip to prevent over-charging the battery overheating and to prevent overheating protector formed. General laptop batteries are 10.8v, 11.1v or 14.4v's. How to distinguish between the quantity of batteries inside it?

Keep in mind that each lithium-ion battery voltage is 3.6v to 3.7v, so to get more than three kinds of voltage, you must first series three or four batteries, and then from n group the composition of such batteries in series  group.

For example, your battery nominal 10.8v/3600ma, it may be 6-cell or 9-pin, single-core power-saving capacity of 1800ma or 1200ma

3, lithium-ion battery charge and discharge limits:

Why laptop battery protection circuit should be built-in charging? This is because the lithium-ion batteries have a certain charge voltage limit, the general 3.6v rechargeable battery should not exceed 4.2v, otherwise it could explode. This requires an external device monitoring charging voltage, in approaching the threshold when to stop charging the same, batteries have discharge limits, the general 3.6v battery can not discharge more than 2.75v, which would otherwise cause the battery failure, which is what we often say "over-discharge."

4, lithium-ion batteries Model:

Lithium-ion battery signal is provided in accordance with its exterior dimensions, usually used in laptop batteries have the following models: 18650,18500,17670,17650, 103448,103450, to 18650, for example, the batteries in diameter 18mm, length 65mm therefore become 18,650.103448 and 103450 belong to the battery box, IBM 240 series on the use of this type of electric HP PAVILION DV9000 SERIES Laptop Battery, wide tall respectively, 10mm, 34mm, 48mm. In general Laptop batteries are used 18650 or 17670 batteries, mainly because the two larger capacity batteries, are smaller and are likely to cause the battery needed shape.
5, what is the change batteries?

Change batteries in the battery pack is to the original batteries out, replace the other batteries. Changing batteries battery manufacturers are strictly prohibited acts, because it has a very high risk. Changing batteries when the battery itself, with a voltage soldering iron or other tool to easily generate electrostatic discharge lead to short-circuit, causing fire explosion. On the other hand, due to charging protection circuit has been written into the original batteries information (capacity, discharge curve, etc.), changing batteries is likely to result in failure protection circuit, which can not be charged, or even lead to overcharging explosion. So, for batteries is dangerous, and there is a risk, it must pay attention! !
6, changing batteries need to pay attention to?

Changing batteries is dangerous, but to save money, so we have to take the risk. Change batteries before the battery should shine some attention (usually around 5% can be placed). This is because the new batteries with only a little more than their own power, if you put a fully charged battery Naqu for batteries, charging protection circuit will always remember with your battery is full charge, even with no electricity for the new batteries, circuit is also not allowed to recharge, and many of the core after changing the battery does not charge for that reason. In addition, changing batteries, carefully check the batteries prior to the model, capacity, brand, sometimes different brands of batteries into the charging circuit, the circuit will automatically lock, resulting in failure for the core. So it'll replace the same kinds of brands of batteries.

Also, changing batteries must be completely replaced, must not only for part of the COMPAQ PRESARIO 2100 Laptop Battery, it is very dangerous, they must gain petty advantages face a significant loss.

Also, do not the blind pursuit of high-capacity batteries, because some of the circuit for the detection of the new capacity is more than the original batteries when the batteries will be locked, or only allowed to charge to the original capacity, so for the success of large-capacity batteries rate is very low.