Mike Del Tergo
mdeltergo at hotmail.com
Tue Feb 10 13:43:26 EST 2004
did you read the article that you quoted?
>From the article"
If the battery is to used in a starting application, Cold Cranking Amps
(CCA) is the second most important consideration; otherwise, for
non-starting deep cycle applications, please skip this section and go to
Section 7.3. Reserve Capacity (RC) or Amp Hour (AH) Capacity. The battery's
CCA rating should meet or exceed, your vehicle's OEM cold cranking
requirement, for your climate. CCA is the discharge load measured in amps
that a new, fully charged battery, operating at 0° F (-17.8° C), can deliver
for 30 seconds and while maintaining the voltage above 7.2 volts.
To start a four cylinder gasoline engine, you will need approximately
600-700 CCA; six cylinder gasoline engine, 700-800 CCA; eight cylinder
gasoline engine, 750-850 CCA;
In hot climates, buying Car or Marine Starting batteries with double or
triple the cold cranking amps that exceeds your starting requirement is a
waste of money because the extra amps will not be used. A starter motor will
only demand what it needs to operate. However, in cold climates a higher CCA
rating is better, due to increased power required to crank a sluggish engine
and the inefficiency of a cold Car battery and the demand is greater. As Car
batteries age, they are also less capable of producing CCA.
Note the requirements for the 4 and 6 cylinder apps. It goes on to say that
at 0 F, a given battery can deliver 65% of the power it can at 80 F and a
given engine is 55% harder to start than at 80 F.
At minus -22F, the same battery output is 40% and the engine is 110% harder
to start. So please feel free to buy the CCA that Audi recommends for your
car (because we all know how easily I5 start) I will continue to go with a
nice wide buffer. WalMart 41-4, 600+ CCA, 700CA, 4 year warrantee, $39.99
(new not rebuilt!)
From: Brett Dikeman <brett at cloud9.net>
Subject: Re: Batteries
More CCA's are not better; go off what the manufacturer recommends in
CCAs and the correct BCI number. In fact- it's worse to get a higher
CCA-rated battery, because the plate mesh is thinner; the more
surface area the plates have, the more amps the battery can deliver.
Plan your next US getaway to one of the super destinations here.
More information about the 200q20v