The battery is made of numerous electrochemical cells connected in aseries-parallel combination to obtain the desired operating voltage and current. The higher the battery voltage, the higher the number of cells requiredin series. The battery rating is stated in terms of the average voltage duringdischarge and the Ah capacity it can deliver before the voltage drops belowthe specified limit. The product of the voltage and the Ah forms the Whenergy rating it can deliver to a load from the fully-charged condition. Thebattery charge and discharge rates are stated in unit of its capacity in Ah.For example, charging a 100 Ah battery at C/10 rate means charging at 10A rate. Discharging that battery at C/2 rate means draining 50 A, at whichrate the battery will be fully discharged in 2 hours
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