According to the 1997 Mercury Cougar Owner Guide :
The 3.8 litre V6 either has the Motorcraft BXT-58 battery or the optional
Motorcraft BXT-65-650 battery
( the optional battery is BCI group size 65 , and 650 cold cranking amps )
The battery cold cranking amps is 650 to 850 ( optional ) according to the Owner Guide and fordparts.com
look for information sticker on battery where the c.c.a. {cold cranking amps} will be listed.
910 cranking amps 700 cold cranking amps
cranking amps or cold cranking amps Group refers to its physical dimensions.
Group Size 65 - minimum 650 Cold Cranking Amps (CCA)
Group 34, about 600 cold cranking amps.Group 34, about 600 cold cranking amps.
"Cranking Amps" are the amount of amps required for the starter to crank the engine. Automobile batteries are measured in "cold cranking amps." That's the amperage capacity of the battery in cold weather.
cold cranking amps
910 cranking amps 700 cold cranking amps
The specification calls for 650 cold cranking amps (CCA) - but with batteries: more is better.
For the 5.4 liter V8 engine in a 2001 E-350 the owners manual shows that the optional battery is 750 cold cranking amps ( they also show that the 6.8 liter V10 engine has a standard battery that is ( 650 cold cranking amps ) and the optional battery is ( 750 cold cranking amps )
The cold cranking amps that are required to start your Ford 2.5 liter engine is dependent upon the outside temperature. 450 cranking amps are required at a temperature of 32 degrees.