Hi! So I'm looking for a battery for my 1972 stock cutlass supreme that I will drive three seasons here in jersey as to not rust out from road salt. I see there's been a lot of talk about CCA and brand, but whether I go with a NAPA or a auto craft or Walmart battery, how do I know which model to get? Seems like there are so many models that will "fit" but what do the group numbers and letters mean? Thank you!
Chris

 

The battery " group " is determined by the physical size ( length , width , height ) of the battery as well as the type and arrangement of the battery terminals .
You should get the proper " group " battery that was recommended by the manufacturer to make sure the battery will fit in the vehicle properly .
CCA is cold cranking amps . And refers to the strength of the battery to crank an engine while cold . Get the highest CCA you can afford to get the best cold weather performance .

 

X2 ^^^.

Do a search on BCI Battery Group Size Chart, it provides all of the specs Charlie Jones mentioned for each group size.

 

'72 Cutlass Supreme takes a 78 group size...and as stated above, the more cold cranking amps, the better. Also, the higher rated batteries come with a better warranty.

 

I generally agree with this, but he said he won't be driving in the winter. But yeah, going with what the manufacturer recommended is a good idea.

I live in a warm environment and cold cranking is not a thought in my mind. The link below has some good info for those of us who live in warmer areas:

https://www.mechanic.com.au/news/how...ou-really-need

 

The higher CCA rating usually includes a higher reserve capacity. That’s how long a fully charged battery can support a constant 25 amp load and not drop below 9.6volts (I think). Basically, useful if you run accessories with the engine not running, or how long you can drive with a defective charging system

 

Group 78 is the larger side terminal battery. Don't be tempted to use the 75 in it's place because it might save a few bucks. If you plan on running an electrical accessories it might be a good ides to grab a dual terminal 34/78 and connect the accessories to the top post. It makes for a much cleaner install and you won't mess with the main cable connections to the car.

 

Thank you all for your replies! Much appreciated!!
Chris