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What is a twenty-hour rate of a battery?(a) The current which the battery can supply continuously for 30 seconds with minimum cell voltage 1.2 V(b) Lasting power of a battery on a small load(c) Time for which the battery can supply 25 A at 80℉ with minimum cell voltage 1.75 V(d) Rate of current for 20 minutes with a minimum cell voltage of 1.5 VThis question was addressed to me in a job interview.The query is from Storage Batteries in division Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

Answer»

The correct CHOICE is (b) Lasting power of a battery on a small load

Easy explanation: A twenty-hour RATE of a battery is the lasting power of a battery on a small load. During this test, the temperature should be about 80oF. This rating is important for POWERING ACCESSORIES when the engine is not running.



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