An average

**car battery has**a capacity of around 48 amp hours which means that, fully charged, it delivers 1 amp for 48 hours, 2**amps**for 24 hours, 8**amps**for 6 hours and so on.Correspondingly, do cold cranking amps really matter?

Well, that's still very important, because

**cold**,**cranking amps**tells you the ability of the battery to**do**work right now. And the higher the**cold cranking amp**rating of the battery, the better it is for your car. See,**cold**,**cranking amps**– CCA,**cranking amps**– CA. The**cranking amps**are rated at 32 degrees Fahrenheit.How many cold cranking amps are needed to start a car?

**400 amps**is probably enough to start most small to midsize CARS and the smallest of SUVs and trucks. To start "bigger" vehicles you will probably need the

**1000 amp**unit. The battery for your car is picked out by the engineers so it's cold cranking amps (CCA) number is bigger than the needed amps to start the engine.

How do you figure out CCA on a battery?

To pass, the voltage must stay above 8.4V for 60 seconds. to SAE J537 and cool to -18°C (0°F) for 24 hours. While at subfreezing temperature, apply a discharge current equal to the specified

**CCA**. (500**CCA battery**discharges at 500A.) To pass, the voltage must stay above 9V for 30s and 6V for 150s.