Replace Car Battery - Superior Automotive

Replace Car Battery Rancho Cordova:


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Modern automotive batteries are a lead-acid storage design. They function as an electro-chemical device that converts chemical energy to electrical energy. When the ignition is switched on, the battery is placed under a load, energy stored in the chemicals is converted into electricity which flows through the wires to its destination.

Standard 12-volt, lead-acid batteries are made up of six cells linked in series, with each cell producing about two volts. The cells are filled with an ionized bath of sulfuric acid (diluted with water) that serves as an electrolyte. In addition to the electolite, each cell a positive plate (usually made of lead dioxide) and a negative plate (composed of straight lead). The plates are separated by insulative, non-conductive sheets called separators. The positive plates are linked to each other and then connected to the postive battery cable and negative plates are linked the same way to the negative battery cable.

A conventional 12-volt automotive battery actually carries a charge of about 12.6 volts. The sulfuric acid/water bath should have a specific gravity of 1.265 at 80 degrees Fahrenheit. Specific gravity refers to the weight of a solution, with water having a reference rating of 1.000. The electrolyte in an car battery is slightly over one-and-a-quarter times the weight of regular water.

Battery power rating is measured by two standards. Generally they are defined in terms of "cold cranking power", determines the amount of current (amps) a battery delivers for 30 seconds at zero degrees Fahrenheit while maintaining a minimum terminal voltage of 7.2 volts. The higher the number, the stronger the battery. The other standard is "reserve capacity rating". This is a warm-weather rating (80 degrees Fahrenheit), which estimates the amount of time required for the terminal voltage of a fully charged battery to dip below 10.2 (or 1.7 volts per cell) at a continuous discharge rate of 25 amps. The rating is expressed in minutes. A rating of 120 describes a battery that will run for two hours (120 minutes) before failing.