A battery has 2 key characteristics, the voltage expressed in Volts (V) and the amount of electricity expressed in Ampere-hour (Ah) or milliamp-hour (mAh). The characteristic energy of a battery is calculated as follows: Voltage (V) x amount of electricity (Ah) = Energy (Wh)

Example: 19.5V x 4400mAh = 85.8 Wh

We can then speak of the capacity of energy instead of power.
What type of battery is used to make self a laptop?

All batteries sold today with the original notebooks are made in Li-Ion, that is to say that it is a type of lithium batteries with the material (lithium) is the ionic state. These batteries are expensive because lithium is an expensive material and their main advantage is the amount of energy that may have put it into a small volume. Key Benefits: No memory effect or effects very low memory (using principle prematurely battery that prevents it from charging to 100% due to poor maintenance of the battery), Excellent value amount of energy / volume due to the physical properties of lithium, Self-discharge (natural discharge when the battery is unused) negligible which allows not to worry about storage, Secure from the first lithium batteries (in the metallic state) through an electronic circuit integrated inside (in the plastic mold).

Main disadvantages: Price, because of the complexity of manufacturing and material (lithium), Deterioration important when you discharge the battery below 10% (up to 20% of capacity lost in one fell swoop!), Charging current limited because of their internal technology and the dangers of lithium, so the burden may seem slow!, Low resistance to high temperatures: it is advisable to use a temperature of 20-25 ° C, but must not exceed 40 ° C under penalty of really damaging. It should never reach high temperatures of around 75-80 ° C under penalty of explosion (not a joke!), Like all batteries they will wear out over time and nothing can reverse the process.

CAUTION:

The batteries of any kind (batteries, rechargeable batteries, lead acid batteries & lithium …) are highly polluting and should never be thrown in the garbage. They must be completely recycled (all hypermarkets, Bricomarché and rubbish bins have skimmers).
You should never try to repair a battery by opening it to burn or severely intoxicated.
Increase the lifespan of the battery of laptop. As mentioned previously, change the battery is a real investment of around one hundred euros in general, so there are some concepts to know and implement to extend the maximum duration of life.

These precautions are: First buy a battery when the first thing to look (after his power in W) is the date of manufacture: actually as announced earlier battery loses its capacity from its manufacture, so the date is more recent plus the battery capacity is close to that declared on the label.

There are many options when it comes to picking out a laptop. Firstly if you are more interested in the brand you will see what the respective company has to offer, then features, style and then the price. But if you are a financial preoccupied consumer you will first range the categories by price. If you are looking for an affordable yet reliable laptop you should see what Compaq Presario has to offer. In most cases, just like any respectable company, they have laptops for any category of consumers: business class, students, high-tech, gamers or just your basic home use.

And after you have picked out the company take a look at the features, the display, weight, design, processor, memory and battery. A battery is very important in a laptop; the longer it lasts the more reliable the laptop is considered. Who doesn’t want to enjoy a wireless experience anywhere for a long period of time? And the good thing about a Compaq Presario is that some laptops are customizable, meaning you can choose the parts you want. And in this category enters the battery also. You can choose between a 6-cell Lithium Ion and a 12-cell Lithium Ion. Choose the last one and you will be able to enjoy up to 5 even 6 hours depending on the applications and specifications of the free cable experience.

Take for example Compaq Presario 700, which is a special design laptop, with rounded corners, silver outlines with black keyboard that will look good anywhere you put it. It runs with AMD Mobile Duron processor and also has Windows XP Home Edition as operating system. It is suited for home basic use and the battery here will last you for a couple of hours, maybe in time you will have to replace it and if you are looking for a compatible yet affordable one I found a cool website for Compaq Presario 700 laptop battery or Compaq laptop ac adapters at some really low prices with one year warranty.

Laptops tend to lose their fascination quickly when you need frequently to look for the nearest power plug to charge up. We all want our laptop battery to last as much as possible. How do you keep your battery energy as long as possible? The answer at this question is what the laptop users are looking for the most. For start we’ll try to expose you some elementary things that you should know about the laptop battery: 1). there are different types of batteries: universal, rechargeable, external; 2). there are different chemical substances used in batteries: Lithium Ion, NiCad, Ni Mh.

How do you keep your energy much time as possible? Here are some tips&tricks that might help you:

- Use the original charger;
- You must make your hard drive as efficient as possible. For that you need to defrag your hard constantly. But be careful, don’t do that while your battery is on;
- Charge the battery after is automatically powers off, the full charge the battery;
- It is important in saving some extra battery power to dim as much as you can your laptop screen;

- When you don’t use the USB devices, even your mouse, remove them. It will help you to save your battery power also;
- If you want your battery to last more, you must clean your battery’s metal contacts, monthly. You can use for that a moistened alcohol duster. If you do that the power from your battery will be transferred efficiently;
- If you use your laptop as a desktop PC, remove the battery. At least, don’t let it in for long time. Remove the battery, not before you make sure that it is charged half from its capacity and store it in a safe place (normal room temperature). But pay attention, you must reinstall your every month and use your laptop till full discharge. Why you need to do that? Because if you let your battery in the laptop while you are using an electrical plug for a long period of time, this will keep the battery in permanently charging state and that diminish the life of the battery;



- Rather use hibernate mode than the standby mode, even if in standby mode you save some of your battery power and also you can continue the work on your laptop from where you left it. But the most useful way for you to save your battery power is the hibernating mode. The advantage of this mode is that your laptop is shut down and the your laptop state is saved;
- Another way to save your battery power is using a lower graphics. If you want to do that, you have to change the screen resolution.