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In the XXI century the desk computer has been replaced with the laptop because it is portable, mobile and compact. You can take it on board an aircraft, on a yacht or elsewhere and keep on working etc. The only downside is that its battery needs to be re-charged. After a couple of hours of usage the battery gets discharged and you have to re-charge it for further exploitation. Laptop producers have not invented a laptop yet which can work 24/7. nonetheless, some major steps have been made to extend battery's life. There are 3 major kinds of laptop batteries distinguished. Nickel Cadmium (NiCd) batteries were the first batteries that could be re-charged. They were quite cheap and produced a lot of power. Nonetheless, they were heavy and are no longer used today. Nickel Metal Hydride (NiMH) batteries are unsuitable for highly advanced laptops of today. They have a higher output if compared with NiCd batteries. Furthermore, they are considered to be cheaper and safer. 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) laptop batteries are generally used in highly advanced laptops. They are lighter comparing with NiCd and NiMH batteries and have no memory effect. Nonetheless, LiON batteries are rather expensive. In fact the more expensive a battery is, the longer your laptop will work. So, it chiefly depends on purposes you use your laptop for. Those who travel widely, need an extended power source. If you want to replace your battery, keep in mind that it should be compatible with a laptop make, in spite of the fact that a lot of laptop batteries these days are compatible with all makes. After that consider 2 main ratings on it: Volts and Milliamps. The voltage should be within 10% of the original battery voltage. When you buy a laptop battery, always look for the one with the biggest Milliamps figure. An external laptop battery is attached to a laptop through an AC adaptor plug consisting of an adaptor, a cord plus 13 other connectors. When you purchase an AC adapter, insure that it will correspond to the current output and voltage. These data are generally submitted on labels of a laptop and on the original adaptor. 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. Insure that the tip dimentions of an AC adapter and the form of a battery you have picked out are similar to the original ones. Certainly, any device requires proper use. Laptop energy devices are no exception. Store and use them correctly and they will serve you long.