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Deep cycle battery
A deep-cycle battery is a lead-acid battery designed to be regularly deeply discharged using most of its capacity. In contrast, starter batteries (e.g. most automotive batteries) are designed to deliver short, high-current bursts for cranking the engine, thus frequently discharging only a small part of their capacity. While a deep-cycle battery can be used as a starting battery, the lower "cranking current" imply that an oversized battery may be required.
A deep-cycle battery is designed to discharge between 45% and 75% of its capacity, depending on the manufacturer and the construction of the battery. Although these batteries can be cycled down to 20% charge, the best lifespan vs cost method is to keep the average cycle at about 45% discharge. There is a direct correlation between the depth of discharge of the battery, and the number of charge and discharge cycles it can perform.〔http://www.bdbatteries.com/images/lifelinelifecycles.jpg〕
== Structure ==
Deep-cycle lead-acid batteries generally fall into two distinct categories; flooded (FLA) and valve-regulated lead-acid (VRLA), with the VRLA type further subdivided into two types, Absorbed Glass Mat (AGM) and Gel. The structural difference between deep cycle batteries and cranking batteries is in the lead battery plates. Deep cycle battery plates have thicker active plates, with higher-density active paste material and thicker separators. Alloys used for the plates in a deep cycle battery may contain more antimony than that of starting batteries.〔David Linden, Thomas B. Reddy (ed). ''Handbook Of Batteries 3rd Edition''. McGraw-Hill, New York, 2002 ISBN 0-07-135978-8, pages 25-44 to 23-53〕 The thicker battery plates resist corrosion through extended charge and discharge cycles.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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