After many hours of searching for what battery exactly fits I decided to try something I haven't seen done before. I purchased this battery:

RT F 4.2 | OPTIMABATTERIES

And I did a side terminal conversion (since I feel our terminals are inadequate anyhow) and it works perfectly. Going side terminal vs top post allowed me to run a shorter battery that actually clears the trunk mat!

 

Great info! Subbed for if I ever replace my battery

 

Nice dude. My yellow top that sticks up annoys me...

 

I bought one for my trans am that is side and top posts and it fits fine in my balt

 

I could have told you this. Had my rt for 6 months now. Love it

 

I bought the biggest yellow top autozone had and it fit just fine in the cobalt. Its not in there any more tho.

 

Thanks guys. I have just seen so many threads and thought I would give an alternative since I had not seen this anywhere. They are also running a promo this month that I was lucky to stumble across:

https://optimabatteriespromotion.com/

 

My yellow top fits fine. That's because I have a raised floor for amps and such. Good find.

 

What year and model is your trans am? Looking for this battery.

 

88 gta

 

i went into local discount auto parts a few years ago and got a blue top and walked out....

 

They can't be vented out of the car so you're letting chemicals out into the passenger compartment.

 

I forget which red top I bought but I had the same problem where when it was installed like the OEM battery it would be to high and the board that cover the batter and the spare tire would not sit flush. I tired lying down the battery on its side and it fits no problem and I was able to secure it with the strap that was there. Ill try and snap a pic and post it.

 

Could explain alot about his obvious handicaps....

 

You mean I'm not the only one that tries to ignore anything he says?

 

Blue top is a marine battery right?

 

lol. yup.