https://www.autobatteries.com/en-us/car-battery-finder?year=2006&make=Honda&model=Pilot&engine=V6-3.5L&find=findMinimum Cold Cranking Amps
That 400 CCA rating at 45° equates to about 270 CCA on a 0° day when it's also much harder to start your vehicle.But 400 Amps is still a lot, especially for the Honda's planetary gear starter. Would it last another year? It cranks strong.
The alternative is to join the auto club, but they may take an hour or two to respond since they're busy servicing everyone else who has a dead battery.But good of you to check it now unlike many people, myself included in the past, who just wait for it to not start some frigid winter morning when you've got to be somewhere, or when it's been sitting all day in your workplace parking lot during an arctic vortex and the only person left you can get a boost from while the blizzard winds bite your cheeks and freeze your knuckles is your "favorite" colleague who'll look at you with smug superiority all the way until the Canada geese fly back up north in the spring.
Yup, if you're lucky, on days when you're most likely to need it.The alternative is to join the auto club, but they may take an hour or two to respond since they're busy servicing everyone else who has a dead battery.
If you're talking charging with a supplemental smart trickle charger (in the garage), it just needs to be newer one that has the appropriate charging schedule for AGMs which most do.Are AGM batteries worth looking into or are they that tricky as some on the web point out in terms of charging?
The more likely scenario is the weak battery causing early failure of the alternator. Replace the battery now, or you may get to do the alternator too, when they both fail.You might need to have your alternator tested to see if you are overcharging the battery and thus damaging it
Do you know that the battery actually delivered 700 cca when new? It is also possible terminal corrosion is limiting the battery delivery. Did you test it with terminals attached, or removed?
Id say at 4 years, you are close to the end in any event. If your cca delivered is 1/3 of what it should be, save yourself trouble and replace it now. Id advise you buy the Interstate battery that CostCo sells. Not sure what make yours is, but likely inferior.