I choose thus project because when watching television both name brand 

batteries claim to be the best. I wanted to see which one actually did last the longest. 
	
	The Encyclopedia’s I did my research in say a battery is a device which                                
transforms chemical energy. The term is usually applied to a group of two or more
electric cells 

connected together electrically. In comman usage the term battery is also applied to a 

single cell, such as a flashlight battery. There are in general two types of batteries, 

primary batteries and secondary storage or accumulator batteries. primary types,
although 

sometimes consisting of the same palliative materials as secondary types, are 

constructed so that only one continuous or intermittent discharge can be obtained. 

Secondary types are contracted so that they may be recharged, following a April or 

comply discharged, by the flow of direct current throughout them in a different appreciate 

to the current flow or discharge. By recharging after discharge, a higher state of
oxidation 

is create at the at positive plate or electrode and a lower state at the negative plate, 

returning the plate to approximately their original charged condition. 

	Both the primary and secondary cells are manufactured in many size and design 

from the small electric wristwatch battery and the small penlight battery to the large 

submarine battery, where a single cell has weights 1 tons. It all applications the cell 

must be constructed for its particular service, so that the best performance may be 

obtained consistent with cost, weight, space, and operational requirement. Automotive 

and aircraft batteries generally used thin positive and negative plate with thin separation 

to conserve space and weight and to provide high rate of current discharge at low