I was told to buy a size 48 battery with cranking amp of 875. Cold cranking of 700. Well I've seen other battery with cranking amp of 900. Cold cranking amp of 770.

What difference does it make if I install the higher cranking amp?

- battery size fitment??
- too much power?

 

You can use what you want just make sure it fits, it is tied down, and you use the vent tube. You can always go bigger you just don't want to go lower.

 

What's the benefit of getting a higher amp?

 

You really only need the higher amps if you are parking your 911 TT outside your igloo. In LA, there is no requirement for a high amperage battery.

 

I'm not quite sure what you mean by that.

 

I just bought the maxx 48 at walmart for $77 with a 3yr replacement warranty. Fits perfectly.

 

How did you get the 3 year warranty? Or does it come with the purchased?

 

bigger the better, wont hurt anything, less strain on your alternator, and wont die as quick if the car sits.

 

Higher CCA (cold cranking amps) are required when your car is exposed to extremely low temperatures. In moderate climates, a battery with the manufacturers stated rating for CCA should be quite sufficient. Sure, more is better, but bigger and heavier are not really what we are going for with a 911.

 

I got the size 48 with 875/700. I'm thinking of returning it and getting the 900/770. I don't think it's heavier than the other...

 

get the one with higher CCAs. I just put in an optima red top with 800CCAs. Starts up just great even in the cold canadian winter! I'll give some feedback when it goes below 20*F. So far so good!

 

Just came with it. Keep your receipt.

 

Ok I'll probably change it to 900/770 just a step higher amps...

Thanks I sure will...