paptekusa's blog

Batteries are all over the place -- in our cars, our PCs, laptops, portable MP3 players and cell phones. A

battery is essentially a can full of chemicals that produce electrons. Chemical reactions that produce

electrons are called electrochemical reactions. In this article, you'll learn all about batteries -- the basic

concept at work, the actual chemistry going on inside a battery, rechargeable versions, what the future holds

for batteries and possible power sources that could replace them.

Quiz Corner
How much you know about batteries and what they do? Test your knowledge with our Batteries Quiz!If you look at

any battery, you'll notice that it has two terminals. One terminal is marked (+), or positive, while the other

is marked (-), or negative. In an AA, C or D cell (normal flashlight batteries), the ends of the battery are

the terminals. In a large car battery, there are two heavy lead posts that act as the terminals.

Electrons collect on the negative terminal of the battery. If you connect a wire between the negative and

positive terminals, the electrons will flow from the negative to the positive terminal as fast as they can (and

wear out the battery very quickly -- this also tends to be dangerous, especially with large batteries, so it is

not something you want to be doing). Normally, you connect some type of load to the battery using the wire. The

load might be something like a light bulb, a motor or an electronic circuit like a radio.

Inside the battery itself, a chemical reaction produces the electrons. The speed of electron production by this

chemical reaction (the battery's internal resistance) controls how many electrons can flow between the

terminals. Electrons flow from the battery into a wire, and must travel from the negative to the positive

terminal for the chemical reaction to take place. That is why a battery can sit on a shelf for a year and still

have plenty of power -- unless electrons are flowing from the negative to the positive terminal, the chemical

reaction does not take place. Once you connect a wire, the reaction starts. The ability to harness this sort of

reaction started with the voltaic pile.

refer links:

Apple A1061(Original Apple Laptop Battery)


661-2472(Original Apple

Laptop Battery)

M8403(Brand new)

Compaq

N400 battery(Capacity: 2200mAh)

HP DV1000

battery(Capacity: 4400mAh)

HP

NC6000 battery(Capacity: 4400mAh)

182281-001(HP NC6000

battery)