Wednesday, February 4, 2009

Two Important Parameters of The Battery

First of all, I'd like to introduce you two important parameters of the battery - voltage and battery capacity, these two parameters are important criterion in measure of battery performance and attributes.      

Circuit voltage is the electric potential difference between two points. The unit of voltage is V (volts), general one alkaline battery have a voltage of 1.5V, nickel-cadmium batteries and nickel-metal hydride battery are 1.2V, while the lithium-ion battery is 3.6V (a small number of manufacturers' lithium-ion battery have a rated voltage of 3.7V).      

Battery capacity refers to the amount of electricity the battery can stored, express used unit mAh (milliampere hours). We can see it is a composite unit, constitutes multiply by the current units and the time unit. For example, an fully charged battery with 70mA current can be discharge sustained 10 hours in ideal situation, we know that this battery capacity is 700mAh from the section multiplied by discharge current and time, in theory, if discharge it in 700 mA you can only use 1 hours (battery capacity divided by discharge current). In large-scale batteries we would normally use a larger unit of voltage like Ah (An pm) to express (1Ah = 1000mAh).

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