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Q: Quick Electronics Question. ( Answered,   0 Comments )
Subject: Quick Electronics Question.
Category: Science > Technology
Asked by: acumen8-ga
List Price: $2.00
Posted: 06 Oct 2003 17:41 PDT
Expires: 05 Nov 2003 16:41 PST
Question ID: 263268
How many amps does a conventional 12 volt lead acid car battery produce?
Subject: Re: Quick Electronics Question.
Answered By: mvguy-ga on 06 Oct 2003 18:20 PDT
It depends on the battery.  Batteries that are more powerful (and
therefore usually more expensive) can produce more amps (which is
proportional to the power they produce) than less powerful ones.  A
low-end battery can produce about 500 amps at 0 degrees F (-18 degrees
C), a high-end one more than double that. Around 800 amps seems to be

The power capability of a car battery is typically measured in
cold-cranking amps (CCA).

Automotive Batteries
"CCAs are the discharge load measured in amps that a new, fully
charged battery, operating at 0 o F (-17.8 o C), can deliver for 30
seconds and while maintaining the voltage above 7.2 volts."

Cars that are driven (and therefore started) in cold climates
generally need more power capability than ones driven in warm
climates. That is because a cold engine is more difficult to start
than a warm one.

The above document also indicates how much power is needed:

"To start a 4-cylinder gasoline engine, you will need approximately
600-700 CCA; 6-cylinder gasoline engine, 700-800 CCA; 8-cylinder
gasoline engine, 750-850 CCA; 3-cylinder diesel engine, 600-700 CCA;
4-cylinder diesel engine, 700-800 CCA; and 8-cylinder diesel engine,
800-1200 CCA.
"In hot climates, buying batteries with double or triple the cranking
amps that exceed your starting requirement can be a WASTE of money.
However, in colder climates the higher CCA rating the better, due to
increased power required to crank a sluggish engine and the
inefficiency of a cold battery. As batteries age, they are also less
capable of producing CCAs. According to the Battery Council
International, diesel engines require 220% to 300% more current than
their gasoline counterparts; winter starting requires 140% to 170%
more current than the summer."

The following page shows a selection of car batteries and the amps
they produce. Note that the CCA ranges from 500 to 1,100 amps. When
it's warmer, the amperage capability increases; the same batteries can
produce from 625 to 1,740 amps at the freezing point of water.

Optima Auto Car Batteries

The ones on this page range from 680 to 1,700 CCA:

West Coast batteries

I hope this fully answers your question.



Google search term: "car batteries" amps
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