Battery is the lifeblood of a mobile phone. All batteries contain one or more cells. A cell is the working chemical unit inside a battery. A cell has three main parts: a positive electrode (terminal), a negative electrode, and a liquid or solid separating them called the electrolyte.
There are four basic types of rechargeable battery used in mobile phones:
1. Nickel Cadmium (NiCd) Batteries
Nickel Cadmium cell phone batteries are based on old technology. The chemicals used in NiCd batteries are not environmentally friendly, and the disposal of cadmium-rich waste is an increasing problem. They are the cheapest variety of phone batteries. Their affordablility helps to bring down the overall cost of mobile phones.
2. Nickel Metal Hydride (NiMH) Batteries
Nickel Metal Hydride (NiMH) batteries claim to be superior to NiCd because they don’t contain cadmium. The cell phone batteries are made from non-toxic materials and are environmentally friendly. They also deliver a higher capacity in relation to their size and weight.
3. Lithium Ion (Li-Ion) Batteries
This is the current and most popular technology for cell phone batteries. The only real drawback of Lithium Ion cell phone batteries is that they are expensive. As such, they tend to be supplied with only top-of-the-line phones. Lithium Ion batteries are slightly lighter than NiMH batteries, but they also have a longer lifetime. A Lithium Ion battery may be damaged by extensive overcharging (continuously on a cell phone charger for more than 24 hours).
4. Lithium Polymer (Li-Poly) Batteries
Li-Poly Batteries are the newest and most advanced technology for cell phone batteries. Ultra-lightweight, they do not suffer from memory effect and will deliver up to 40% more battery capacity than a Nickel Metal Hydride (NiMH) of the same size.