Battery Basics-2


Alkaline Batteries
           

The most popular battery composition is alkaline. Alkaline batteries have a sloped discharge curve. Their voltage gradually drops off over the life of the battery until eventually, the battery is no longer usable. Although the discharge curve is sloped, it is still flatter than zinc-chloride and carbon batteries. Alkaline batteries can deliver up to 80% of their original capacity after being stored for four years. This makes alkaline batteries ideal for emergency devices such as flashlights, radios, and TVs.

Alkaline batteries are 8 to 10 times more powerful than the zinc-chloride or zinc-carbon batteries. They’re very good for use in high-current applications, such as motorized toys and portable TVs. Since they are able to emit large amounts of current for short periods of time without significant voltage loss, alkaline batteries are also ideal for photo flash units.




Lithium Batteries
           

Lithium batteries are great for long-term use. They last 2-3 times longer than alkaline batteries. Lithium batteries also perform well n extreme temperatures and are an excellent choice for devices such as smoke detectors and wireless alarm systems. These batteries are able to ahndle excessive current applications, like CD players and portable computer equipment. The discharge curve of a lithium battery is similar to that of an alkaline battery; however, some lithium batteries have shelf lives of up to 10 years!



Nickel-cadimum
           

Nickel-cadmium (Ni-Cd) batteries introduce a different spectrum of battery use. Once these batteries have reached the end of their effective lifespan, they may be recharged over and over again, up to 300 times. Ni-Cd batteries feature a flat discharge curve, which means they will deliver their full voltage for a length of time, then suddenly discharge. This works well in motor-driven devices, such as RC cars and CD players.



Hi-capacity Ni-Cd
           

Hi-capacity Ni-CD batteries are a great step-up from standard Ni-Cd batteries because of greater current capacity. The voltage rating on hi-capacity Ni-Cd batteries are the same as standard Ni-Cd batteires. One major disadvantage of Ni0Cd batteries is the cell capacity.  The cells in Ni-Cd batteries produce only 1.25 volts each. Batteries with multiple cells are usually rated in multiples of 1.2 volts. For example, the 9 volt equivalent Ni-Cd battery only provides 7.2 volts (6 cells x 1.2 volts). As a result, Ni-Cd batteries are not recommended for voltage-dependent devices such as clocks.


Rechargeable Alkaline
           

Rechargeable Alkaline batteries are yet another option. They have the advantage of having the exact same voltage as standard alkalines, so they are interchangeable in every situation. Unlike any of the other rechargeables, they come charged and ready to use (because they do not lose their charge as quickly as the others). Rechargeable alkaline batteries cannot be recharged as many times as other rechargeable batteries, however. An absolute maximum is about 100 times, but the maximum voltage is reduced as the number of cycles increases.


0 মন্তব্য(গুলি):

একটি মন্তব্য পোস্ট করুন