Need to replace a battery on one of my cars. The battery currently in the vehicle is 550 CCA RA 110. I have a new red top Optima battery with 800 CCA RA 100 just sitting on a shelf in the garage.

Any issues installing a battery with a much higher CCA number?

As long as it fits... No Problems! The larger the CCA the better off you are in cold starting.
You gain a whole lot more capacity in red top which is a huge advantage!
Also as an AGM type battery, you wont get any corrosion on your terminals!
If you have a trickle charger I would top it up before install though !

Art,

Thanks. I thought I read somewhere it mattered, glad to know it doesn't.

The higher the CCA, the better.

Just a couple weeks ago, I took my lawn tractor battery(245CCA) and put it in the Bonneville. It starts it up just fine for some reason.

That'* funny, I think I recall El Tato posting that he took his Park Avenue battery and putting it in his scooter or motorized bicycle or something ......

Problem with his is, it will take forever for the little alternator on the scooter to charge up a 600 CCA battery. But its the other way around for my 120 amp Bonneville to charge a 245 amp tractor battery.

On the Optima battery, it is a "red". Doing some research, the "yellow" Optima typically has less CCA but do better with drain from accessories when the vehicle is left sitting. I bought the red Optima at a Oreilly Auto Parts in Arizona. I am going to see if the have Oreilly Auto Parts in PA, and see if I can trade up to the yellow Optima. Right now Oreilly'* web site is down.

If that is true (drain down concern) then the yellow top should have a much greater RC (reserve capacity) normally rated in minutes...
As far as I am concerned they are all Deep Cycle and The red top if it has the larger CCA I would stick with that. Amps when cold (CCA) really matters.
What is the CCA / RC of the yellow anyways?

the charge time of the batteries is the difference, and discharge they are related. the red is a starting battery, it is designed to discharge and charge more rapidly than the yellow, which is meant for sound systems or aftermarket lights and such. but whatever you take out of a battery has to be put back in so if something happens where it takes linger to start its going to take longer to put back in.