From digest.v7.n969 Sun Jan 18 09:47:07 1998
From: Ron Stygar <RonStygar_at_aol.com>
Date: Sun, 18 Jan 1998 00:50:55 EST
Subject: Re: CCA to AH conversion
From the Battery Council International book dated 9/95.
There is no relation of CCA to AH in the book.
AMPERE-HOUR (Amp.-hr, AH)
A unit of measure for a battery's electrical storage capacity, obtained by multiplying the current in amperes by the time in hours of discharge. (Example: A battery which delivers 5 amperes for 20 hours delivers 5 amperes x 20 hours = 100 Amp-Hr of capacity.)
COLD CRANK RATING (CCA)
The number of amperes a lead acid battery at 0 degrees F can deliver for 30 seconds and maintain at least 1.2 volts per cell.
CRANKING PERFORMANCE (CA)
The number of amperes a lead acid battery at 32 degrees F can deliver for 30 seconds and maintain at least 1.2 volts per cell.
RESERVE CAPACITY RATING
The time in minutes that a new, fully charged battery will deliver 25 amperes at 80 degrees F and maintain a terminal voltage equal to, or higher than, 1.75 volts per cell. This rating represents the time the battery will continue to operate essential accessories if the alternator or generator of a vehicle fails.
Ron_at_unofficialbmw.com, FLI BMW, FLY BMW, Marlborough, CT
Unofficial RS/SS bender/shortener/installer +