| Today the LAPTOP has replaced the desk computer,as it is compact, portable and mobile. You can take it aboard a plane, on a ship or elsewhere and continue working etc. The only disadvantage is that it has limited power. After a couple of hours of use the battery gets lower and should be re-charged for further usage. Laptop developers have not invented a laptop yet which can be exploited all day long. nevertheless, some major steps have been made to extend battery's life. There are three major types of laptop batteries distinguished.
Nickel Cadmium (NiCd) laptop batteries were the first batteries that could be re-charged. They did not cost much and had a high output. Nevertheless, they were quite heavy and are not used nowadays any more.
Nickel Metal Hydride (NiMH) laptop batteries can be used for the older generation of laptops. Their output is higher if compared with NiCd batteries. More than that, they are believed to be safer and cheaper. The only disadvantage is the so-called memory effect they have. If the NiMH laptop battery has not discharged fully, it will remember it and its output will be lower.
Lithium Ion (LiON) batteries are usually installed in technically advanced laptops. They are lighter than NiCd and NiMH batteries and do not produce any memory effect. Nonetheless, LiON laptop batteries cost a lot.
Actually the price for a laptop depends on how long you can make use of it. So, it largely depends on purposes you use your laptop for. If you travel widely, you definitely need an extended power source.
If time has come to replace your laptop battery, remember that it should be compatible with a laptop make, despite the fact that a lot of laptop batteries these days are compatible with all makes. After that consider 2 major ratings on it: Volts and Milliamps. The voltage should be within 10% of the original battery voltage. When buying a laptop battery, always seek the one with the biggest Milliamps figure.
An external laptop battery is connected to a laptop via an AC adaptor plug that consists of an adapter, a cord and 13 other connectors.
When buying an AC adaptor, insure that it will suit the current output and voltage. These data are commonly provided on labels of a laptop and on the original adapter. The letter 'V' means voltage and 'A' or 'mA' - current output. The voltage figure is to be within 10% of your original adapter voltage. The Amps figure can be higher but should not be lower than the original current output.
Another thing to keep in mind is that shape of a battery and the tip dimensions of an AC adapter should be identical to the original ones.
It goes without saying that any device requires proper use. Laptop power sources are no exception. Store and use them according to safety regulations and they will serve you longer. |
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