iPad & Lemon Battery

In an iPod, computer, iPad, and many more things there is a battery called an ion lithium battery. Each cell of a lithium- ion battery produces about 3.7 volts, while the average AA battery produces 1.5 volts. Lithium-ion batteries are popular because they have a number of important advantages over competing technologies.
1) They're generally much lighter than other types of rechargeable batteries of the same size. The electrodes of a lithium-ion battery are made of lightweight lithium and carbon. Lithium is also a highly reactive element, meaning that a lot of energy can be stored in its atomic bonds
2) They hold their charge. A lithium-ion battery pack loses only about 5 percent of its charge per month, compared to a 20 percent loss per month for NiMH batteries.
3)They have no memory effect, which means that you do not have to completely discharge them before recharging, as with some other battery chemistries.
4)Lithium-ion batteries can handle hundreds of charge/discharge cycles.
(http://electronics.howstuffworks.com/everyday-tech/lithium-ion-battery.htm)

In class we made our own battery by using a lemon, a penny, and a nail.  In class we discussed voltage, which is a field surrounded a charged object. The lemon acted as a battery, and the nail and the wires as charges. In class we used these to see how much voltage we could make and to see if we could make a little light go on.