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Go find all my posts on this and you will see you are repeating what I say to people who ask why their vehicles with aftermarket electrical accessories are chewing their batteries up.

deadduck asked about the CCA of the different vehicles. I'm explain that there is no reason at all for the stock Tow Package to have a larger CCA than all the others. All Titans have the same engines and components that energize during starting.

Now when you get into aftermarket accessories that is where people are overtaxing the system an no matter what the CCA is of the battery it won't help. Neither will the stock Alternator if the accessories are pulling more juice off the battery than the alternator is replenishing while also keeping all the electronics alive.
However for short bursts at stop lights and signs a larger CCA battery will be just enough...
 

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Best battery for the duckets would be a sears die hard platinum... (AGM)... and Interstate Megatrons are at the top of the regular lead-acid group.
 

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What battery did you put in and are you pretty much stock electrically?
It is a Super Start Platinum 34R, it is an AGM (absorbed glass mat) battery, with 995 Cranking amps and 775 Cold Cranking Amps, 120 reserve capacity, it was about $125, which was the best deal around for an AGM battery when I was looking about a year ago. I believe I got mine at Autozone, but it looks like it is $145 right now at O'Reillys. Autozone has a battery that looks the same, for the same price on their website. It took no modification to install, and I am stock electrically. I believe the stock battery is a little size 24 or 24R.

Super Start® Platinum 34RPLT - AGM Battery | O'Reilly Auto Parts
 

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Don't try an make sense of it. Yes the Tow package equipped Titan has a different battery than the non tow equipped. At least they did from 2004-2007. Why? Because when towing something such as a travel trailer the truck battery will supply battery power to the TT to power certain things like the fridge and lights, it also helps to maintain a charge of the TT batteries. The electric brakes and stop lights are not a huge draw.
 

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People need to really read some of the links I'm posting and understand how a battery works. The larger battery CCA does nothing when the vehicle is running. A larger alternator would do that as well as a greater reserve capacity when sitting at lights and stopped while the engine is running. When moving the alternator supplies power to everything. The battery is just being charged and helping out when you stop. And again it's the greater reserve capacity that matters, not CCA.

If you look at the reserve capacity for the larger CCA batteries they are sometimes the same or worse than smaller batteries.
 

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I went ahead and changed out the stock battery after five years but it was not dead yet, I've had the Interstate Magatron Plus for the past four years and it is still working well.
 

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My last response from the link attached from #2 & #3. also look at #8 for anyone having issues with their batteries dying early deaths. People need to be concerned with RC rating instead of just looking at the highest CCA:

Frequently Asked Questions (FAQ) - DC Battery Specialists

"(CCA) is the maximum amperes that can be continuously removed from a battery for 30 seconds at 0°F before its voltage drops to unusable levels. A 550 CCA battery can supply 550 amperes for 30 seconds at 0°F. This rating is only useful in the selection of engine starting batteries."

"Batteries promoted on their high Cold Cranking Ratings are easy and inexpensive to build. The market is flooded with them, however their Reserve Capacity, Cycle Life (the number of discharges and charges the battery can deliver) and Service life are poor. Reserve Capacity is difficult and costly to engineer into a battery and requires higher quality cell materials."
 
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