WEBVTT - Why do batteries die but then come back to life?

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<v Speaker 1>m z y dot com. Welcome to brain Stuff from

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<v Speaker 1>how Stuff Works dot com where smart happens Him Marshall

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<v Speaker 1>Brain with today's question, what is the difference between a

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<v Speaker 1>normal lead acid car battery and a deep cycle battery?

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<v Speaker 1>People who have recreational vehicles and boats are familiar with

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<v Speaker 1>deep cycle batteries. These batteries are also common in golf

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<v Speaker 1>carts and large solar power systems, where the sun produces

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<v Speaker 1>power during the day and the batteries store some of

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<v Speaker 1>that power for use at night. Both car batteries and

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<v Speaker 1>deep cycle batteries are lead acid batteries that use exactly

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<v Speaker 1>the same chemistry for their operation, and the differences in

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<v Speaker 1>the way the batteries optimize their design. A car's battery

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<v Speaker 1>is designed to provide a very large amount of current

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<v Speaker 1>for a short period of time. This surge of current

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<v Speaker 1>is needed to turn the engine over during starting. Once

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<v Speaker 1>the engine starts, the alternator provides all the power that

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<v Speaker 1>the car needs, so the car battery may go through

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<v Speaker 1>its entire life without ever being drained more than or

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<v Speaker 1>so of its total capacity. Used. In this way, a

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<v Speaker 1>car battery can last a number of years. To achieve

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<v Speaker 1>a large amount of current, a car battery uses thin

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<v Speaker 1>plates in order to increase the surface area. A deep

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<v Speaker 1>cycle battery is designed to provide a steady amount of

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<v Speaker 1>current over a long period of time. A deep cycle

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<v Speaker 1>battery can provide a surge when needed, but nothing like

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<v Speaker 1>the surge a car battery can. A deep cycle battery

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<v Speaker 1>is also designed to be deeply discharged over and over again,

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<v Speaker 1>something that would ruin a car battery very quickly. To

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<v Speaker 1>accomplish this, a deep psycle battery uses thicker plates. A

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<v Speaker 1>car battery typically has two ratings, the cold cranking amps,

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<v Speaker 1>which are the number of amps that the battery can

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<v Speaker 1>produce at thirty two degrees fahrenheit for thirty seconds, and

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<v Speaker 1>the reserve capacity, the number of minutes that the battery

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<v Speaker 1>can deliver twenty five amps while keeping its voltage above

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<v Speaker 1>ten and a half volts. Typically, a deep psychle battery

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<v Speaker 1>will have two or three times the reserve capacity of

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<v Speaker 1>a car battery, but will deliver one half the cold

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<v Speaker 1>cranking apps. In addition, a deep cycle battery can withstand

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<v Speaker 1>several hundreds total discharge and rescharge cycles, while a car

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<v Speaker 1>battery is not designed to ever be totally discharged. For

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<v Speaker 1>more on this and thousands of other topics. Is it

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<v Speaker 1>how stuff works? Dot Com? Stuff happens, Just don't let

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<v Speaker 1>it happen to your photos, music and documents for text,

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