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A battery is defined as "a combination of galvanic cells for generating an electric current." In layman's terms this means a device that generates an electrical current through a chemical reaction. Batteries are required in most gadgets that are use in today. Batteries come in a variety of sizes and shapes and are used in radios, CD players, flashlights, camcorders and cell phones amongst others. Batteries with different chemistries have differing capacities and voltages. Batteries can be divided into primary and secondary types. The former category includes alkaline and carbon-zinc mercuric oxide, silver oxide and lithium primary batteries.

The secondary batteries include nickel cadmium, nickel metal hydride, rechargeable lithium and lead-acid. Batteries with a cylindrical shape range from the very small AAAA to larger ones. Every implement, gadget and equipment has a particular type of battery it uses. Typically the size of the battery is in proportion to the size of the gadget or equipment it is used in. Batteries need to be paid some special attention with regard to maintenance, repair and storage. A cool and dry atmosphere is one of the prerequisites for storage of a battery. Most batteries are recyclable and it is always a good idea to do so. Household batteries can be disposed of with the household waste.

Be sure never to throw batteries into the flame for there is a good chance they will explode and catch fire. It is also not advisable to throw away a whole bunch of batteries together because most batteries have some charge left in them and there is a chance of the charges interacting. Whatever gadget you may be using it is advisable to always keep a spare handy. Another good option is the rechargeable batteries which are also available for most battery-using things today. Most things like digital cameras drain the batteries fast.

 
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