CCA of the stock battery depends on your package, whether or not you have the towing package.
Stock no tow is a 600
Towing package has the upgraded 750
The reserve capacity is pretty good on the stock batteries so if you do replace it, make sure the reserve capacity is good(like 120min or so) Most are 90min.

I would take a Multimeter to your battery and see what the voltage across the terminals read when NOT running. Make sure you start it up, let it run for a few minutes and then turn it off so you can read the charged voltage. that will tell you how well the battery is doing.
HERE is a bettery testing/info link for ya.

 

I have the original mopar battery in my 2002 as well. The battery is stamped june of 2001. Ive never had a battery last this long. Im at 126,000 miles and battery is still going strong. Never had the jump the battery yet, in the 4 years that ive owned it.

 

Around here everyone (including me) has jumper cables in the truck so I would wait until it shows signs of giving up and then replace it.

 

A battery doesnt have to show signs to determine if it's bad or not. There could be one or 2 dead cells and you may not realize the difference, meanwhile, your alternator is working extra hard to charge a battery that has a few cells that are depleting the power immediately.
A bad battery makes your alt. work harder and can burn it up quicker. Just some food for thought. Doing a check as in the link I gave is the best way to find out how your battery is doing. Waiting till it dies is like waiting for something in your engine to cause failure before changing your oil. Yes, the battery change is not catastophic, but it follows the same principles as what I call "preventative maintenance". Never, not once have I been stuck on the side of the road in all the years I have driven $500 beater cars because I follow that principle. So you know, that's 13yrs. I've owned 26 different vehicles in that time and ~12 of them were around that $500 mark...lol

 

here is my thread when my battery died, I'd say just change it

https://dodgeforum.com/forum/3rd-gen...sh-lights.html

 

Had both batteries in the 02 cummins last until 2009 when i just replaced because winter was coming and it gets -40 here sometimes... they never missed a beat the whole time.(handled a winch, lights, camper, boat all that no problem).. Had the stock 1997 battery in my exploder in 2007 when i got it and i think the stock 96 battery in my ram when i got it in ... 09..

 

No idea, have never paid it much attention. I do have the factory tow package.

I always carry some jumper cables in my tool box. I'll probably check out the advance auto thing online with the discount code given. If I can get out for less than 100 bucks, no need to push my luck and be begging for a jump from someone. No doubt it will happen when it's the most inconvenient and/or when I'm in a hurry and don't have time to deal with it.

Thanks for the opinions and info.

 

Most do the test for free, and it will tell you what the condition of the battery is.

Pretty simple.
Cables and start paks are always a good idea, that way you can be someone else's hero.

 

i change my battery every 5 years, and put it in my lawn tractor, then throw the lawn tractor one out

 

Ha Marx! Must be a big tractor. I don't have a single vehicle that this battery will fit in other than maybe my golf cart, which takes some sort of special type of battery rather than a typical auto battery. That's a great idea though, I just don't have anything it will fit in. I've got a 4-wheeler and a 0-turn mower that both take similar size batts but I'd have to get the sawzall out to make this one fit. That goes for my wife's Jeep and my daughter's RX-8 too.

I just put a 3rd battery in my daughter's RX-8 and it's an 05 with barely 50k miles on it. I replaced the one in my wife's Jeep last year at 5 years for no other reason than to not have to hear her bitch if/when the original one went dead.