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The short answer is: “Whichever type fits your laptop.”

Laptop batteries vary according to the model and type of laptop computer for which they’ve been designed. All laptop batteries do, however, share some common characteristics that differentiate them from regular household batteries:

• Laptop batteries are rechargeable
• They are composed of multiple internal cells
• Within each laptop battery is a small printed circuit board
• Shape and location of terminals differ from model to model.

As is the case with all batteries, laptop batteries create an electrochemical reaction, forcing a stream of electrons from one position to another. Also like other batteries, laptop batteries have positive and negative terminals that receive and send electrons.

Rechargeable batteries are more complex, however, than standard batteries. This is because the electrochemical reaction that provides power must be reversible. Care has to be taken when recharging them to ensure they perform at their best.

Frank McLarnon, Lawrence Berkley lab’s staff scientist explains it this way to Scientific American.com:

“When a battery is discharged, an electrochemical oxidation reaction proceeds at the negative electrode, and an electrochemical reduction reaction occurs at the positive electrode. When one attempts to recharge a battery by reversing the direction of electric current flow, the opposite takes place: a reduction reaction proceeds at the negative electrode, and an oxidation reaction takes place at the positive electrode.

In the case of the rechargeable battery, the electrochemical oxidation-reduction reactions are reversible at both electrodes. In the case of the non-rechargeable battery, when one attempts to recharge the battery by reversing the direction of electron current flow, at least one of the electrochemical oxidation-reduction reactions is not reversible. When the battery is charged, the overall reduction reaction that proceeds at the negative electrode may not be the true reverse of the oxidation reaction that proceeded when the battery was discharged.

If the laptop battery process isn’t exact, then unwanted build up can take place on either terminal over time, which can cause a dangerous short-circuit.”

It is so important to ensure that your laptop battery or notebook battery is the one designed for your particular model and type. Only buy Dell laptop batteries for a Dell laptop computer, Gateway aren’t compatible with Compaq laptop batteries and Toshiba laptop batteries won’t sit well in a Sony.

It is also wise to remember that old adage: “You get what you pay for.”
Some companies offer used “cheap laptop batteries” for sale, saying that they have refurbished each battery and restored most of its useful life. The fallacy of this is that, although possible to refurbish a second-hand laptop battery, the cost to do so would be more than the price of a new battery. So, “Buyer beware,” and if you must buy discount laptop batteries, buy new discounted batteries.

Laptop computers are a boon to business, large and small. As a wise person is just about to say: “Look after your laptop and it will look after you.”

A small business run from home or on rented space, while it can be extremely profitable, cannot be furnished in the same style as a large-scale company office. Using standard full-size desktop computers in such a set up is impracticable, as it takes up too much space and is too bulky for cramped confines. To deal with such a situation, desknotes or transportables may just hold the key.

Desknotes are systems that can be alternately used as a standard desktop PC, but also offers portability into the bargain. Desknotes have the same power levels as a desktop PC and occupy much less room. Moreover, to keep expenses to a minimum, it is possible to install a LAN amongst the desknotes, where only one laptop need be connected to the Internet and access is shared to all the laptops connected to the network. This is also true for the devices connected to the central laptop; through LAN, all the laptops can use the same device. Thus, for small offices with three or more laptops, LAN (Local Area Network) is surely a boon.

LANs usually span a building or a small group of buildings. Connecting one LAN with many others through telephone lines and radio waves is called WAN (Wide Area Network). A Local Area Network that uses radio waves to communicate is called WLAN (Wireless Land Area Network). There are several advantages to WLANs. One is its flexibility. Radio waves can pass through walls of nearly any surface, and also do not require miles and miles of cables, thus offering a clutter-free work atmosphere. Wireless LAN can be almost invisible!

Another advantage is that WLANs are extremely easy to use. Most laptops are built in with WLAN capability. So all you need to do is plug in and make sure you have a wireless LAN card. WLANs are very tough. If one base becomes disconnected, it is possible to use another laptop as a base and can be shifted physically into the range of another WLAN. Prices are very low these days for WLAN, and it is no wonder the choice for home networks.

However, as nothing is perfect in this world, WLAN does carry a few disadvantages. Anyone can operate a laptop near a WLAN and hack into the stored wireless traffic. This makes safety an issue due to the loss of privacy. While radio waves can pass through almost any surface, too many obstacles in the path such as buildings can degrade the transmission. Another drawback is the data transfer speed. As many laptops share the same bandwidth, data transfer speeds are significantly lower in a WLAN. In addition to this, wireless data rates fall according to signal strength or interference.

Wireless LAN is convenient where mobility is required, and is the only choice in old buildings where cables cannot be installed. Companies usually provide wired connections for fixed offices, and wireless LAN for those users who have no fixed location. In the end, WLAN should be installed only after taking into account all factors regarding your office or home set up.