Our 2007 odyssey the battery died after only one year. Bought new one now four days later car won't start again. We left no lights on or radio, not even the dvd player. What's wrong with this battery.

The radio is displaying the word CODE which means you need to put in the code. The code is usually written in the owners manual or on a card that looks like a credit card. If you can't find the code, you will need to bring it to the Honda dealer and have them pull the radio to retrieve the code.

Just a couple problems I've had. dome light left on due to faulty door open switch, spot light charger or equipment left plugged or wired to battery, lately I thought I had a bad battery but I just need to clean the terminal connections. One more thing if your car is running you can pull the negative cable off the battery. If the car dies your alternator could be the problem. If you have a light in the trunk or under the hood you could pull the bulb out to make sure you don't have a faulty switch turning them on. These are kind of simple and that is the way I start out.

all new cars are set up that if the battery deads it goes into lockout mode. it is so the dealer ships can make money

dose the car try to turn over

Check all fuses ,wiring anywhere short or check alternatour

Check the anti-theft module and relay

You may have a parasitic drain on the electical system , do you know what that is ? Watch this video !
Chevrolet Truck Battery Dies Overnight Part

new alternator required

Yes your radio need a code and you suppose to have it when you bought the car. So now call your dealer and ask for the code and i think they will ask for your information and your VIN number. Good luck

We had the same issue with our 2007 Yukon Denali XL. Died on us twice after sitting for short periods of time; once we watched a DVD with the engine off and battery died within 10 minutes. The dealership kept it overnight to troubleshoot why the battery died so quickly. They said the radio was "pulling" too much from the battery. (They supposably fixed it) But again a few days later the battery died again after sitting overnight. We brought it back to the dealership and they brought in a GMC "expert" to replace the entire DVD/CD/Navigation system. They also replaced our battery with a much larger battery, similar to the ones that GMC puts in there diesel trucks. They had our Denali for 5 days, but it appears to be fixed now.
Getting it fixed correctly wasn't without headaches, but it was all covered under warranty, including the battery. And they are updating the nav w/ the new edition disc as well for no charge.