Battery tester
Rechargeable batteries are an important source of clean portable power in a wide variety of electrical applications, including automobiles, boats and electric vehicles. Automotive vehicles include a storage battery for operating electronics in the vehicle and using an electric starter to start the vehicle engine. A battery charging system is coupled to the engine and is powered by the engine when the vehicle is running. The charging system is used to charge the storage battery when the vehicle is operating. Lead-acid batteries are one form of rechargeable battery that are commonly used to start engines, propel electric vehicles, and to act as a source of back-up power when an external supply of electricity is interrupted. Because the lead-acid batteries can be depleted of power overtime, such as when they are not in use over a period of time, or when a light in a car is left on for an extended period of time, they need to be recharged and tested. In order to make optimum use of such a battery, it is very desirable to test the battery to determine various battery parameters such as state of charge, battery capacity, state of health, the existence of battery defects. Battery testers typically determine the condition of batteries, i.e., determine the internal resistance of a battery, by either a load test or a small-signal analysis of the battery. A typical electronic battery tester provides an output which is viewed by a user or technician. The data is used to make a determination regarding the condition and possible need for replacement of a storage battery. Electronic battery testers have become accepted in the marketplace. In addition to their convenience as hand-held instruments without heavy cables, they are safer because the small currents drawn avoid dangerous sparks. Electronic battery testers do not require the battery to be fully charged in order to test nor will electronic battery testers weaken an already low battery.
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