Originally Posted by Mr_D
I don't see how people can blame the battery in the CR-V. The battery works fine for many years when not being towed. It's only when you tow it that the battery becomes a problem. Nothing wrong with the battery or it's size, just people are using it for something it's not designed for.
Even the much bigger battery in our Ody is discharged in a day or so. Since adding the charge line works fine. On a 7 pin plug it's #4 that is the hot one if you follow the standard wiring diagram.
Please don't mislead folks on this. The battery is undersized on the CRV especially on the models with the nav system that draws with the key on ACC. Throw in the normal parasitic load and a braking system and the battery simply cannot handle the load. Also, when the recommended fuse is pulled, it does not disconnect the nav but does disconnect the Aux power socket so my Patriot would not work. Pulling the fuse was not an option.
In colder climates there are Many complaints about dead battery on the CRV from people who don't tow the car. And to say it's not designed for towing is not really accurate. This car was sold specifically on the premise that it is 4 down towable. The dealer even installed the base plate and wiring kit. The owners manual addresses the subject of towing behind a motorhome. Yes, it is designed to be towed.
Then of course, each time the battery is run down, the less time it will hold a charge. The OEM group 51 battery is rated at about 400 CCA. The replacement (same as the Odessy) is rated at 800+ CCA depending on which battery you get. Huge difference.
I even had mine go dead while not towing when I stopped for fuel on a foggy day and accidentally left the lights on for less than ten minutes, it was stone dead, would not even click the solenoid.
That is when I decided to change the battery and I have never had a dead battery since. Even after towing for two days without unhooking and just starting in the AM to lube the transmission. Prior to that, I was stopping every couple hours to run the car for at least 30 minutes or for sure after a four hour day, we would arrive with a Stone Dead battery and my Patriot beeping and showing a fault. I do have a functional charge line by the way.
Without admitting it Honda has acknowledged the problem by putting the group 24 battery in the 2015 models. Unfortunately, the 2015 as you know, is not towable.
Don't get me wrong, I like my Honda a lot. If they had put in a decent sized battery to begin with, it would have been the Perfect Toad. I had mine in to the dealer twice to test the battery and charge system and each time they said it "tested to spec".
When I went in to buy the new battery box for the Odessy, the service manager and parts guy both said, "yeh, a lot of people are changing their battery".
As I have said in my posts a number of times on this subject, you can add all the gizmos you want but eventually it will come down to installing a larger battery and your troubles are over.
Sorry for the lengthy rant but I read in this and other forums about the dead battery on the CRV and feel that folks need to know the cure for the problem.