Cell Phone Rechargeable Batteries

Cell Phone Rechargeable BatteriesCell phone batteries are divided into the following types according to the production technology: nickel-cadmium, nickel-metal hydride, lithium-ion, lithium polymer. Nickel-cadmium batteries are the most common and the least costly type of batteries. It is some sort of an old-timer on the cell phone market. The tried-and-tested technology and reliable operation provided a wide application of this type of batteries as a power source for portable devices and equipment. The main advantages of nickel-cadmium batteries are that they can withstand a wide range of ambient temperatures, and can be charged at negative temperatures; they can supply large current to the load; they are low sensitive if misused and maintained improperly; they easily recover at decreased capacity and after a long storage; and they are low cost. The following disadvantages can be mentioned: the batteries require a regular full charge to maintain their running abilities (the removal of memory effect); large size. Because of their large size and disposal difficulties, nickel-cadmium batteries have long been out of the market, and they were used only at the onset of the cell-phone market massive development, for example, in Т-192 Motorola cell phones. They were replaced by nickel-metal hydride batteries whose advertised advantages did not in fact meet the expectations of consumers due to their short lifetime. At present cell phones of different producers are supplied only with lithium-ion batteries that have gained a foothold in the market for mobile devices because of their advantages over the above-mentioned types of rechargeable batteries. High electrical power density, a slow self-discharge rate, no maintenance requirements. Lithium polymer batteries appeared in the market for cell phones and portable computers only a few years ago, they are much cheaper than lithium-ion batteries at the same power density. Lithium polymer batteries have flexible shapes not typical of conventional types of batteries. They are very thin, and can fill any free space. The main parameters of rechargeable cell-phone batteries are their capacity, internal resistance, voltage, discharge rate, lifetime.

Category:

Science & Technology

Tags:

• accumulator
• battery
• power supply