BatteriesBATTERY OPERATIONSParallelCellsFigure 8 Cells Connected in ParallelCells connected in parallel(Figure 8), give the battery agreater current capacity. Whencells are connected in parallel, allthe positive terminals areconnected together, and all thenegative terminals are connectedtogether. The total voltage outputof a battery connected in parallelis the same as that of a single cell.Cells connected in parallel havethe same effect as increasing thesize of the electrodes andelectrolyte in a single cell. Theadvantage of connecting cells inparallel is that it will increase thecurrent-carrying capability of thebattery.PrimaryCellCells that cannot be returned to good condition, or recharged after their voltage output hasdropped to a value that is not usable, are called primary cells. Dry cells that are used inflashlights and transistor radios (e.g., AA cells, C cells) are examples of primary cells.SecondaryCellsCells that can be recharged to nearly their original condition are called secondary cells. Themost common example of a secondary, or rechargeable cell, is the lead-acid automobile battery.CapacityThe capacity of a storage battery determines how long the storage battery will operate at a certaindischarge rate and is rated in ampere-hours. For example, a 120 ampere-hour battery must berecharged after 12 hours if the discharge rate is 10 amps.Rev. 0 Page 11 ES-04
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