battery problem on 2007 Odyssey

My parents have a 2007 Honda Odyssey minivan with right around 14,000 miles on it. It doesn't get driven a whole lot. The car is on its 3rd battery. The dealership tells them that the batteries are going bad because they don't drive the car much.

The last issue happened 2 weeks ago. My mom said the car had sat for a week and she went out to run errands and it started with no problem. Then the next day she had to drive it again and it wouldn't start. It was towed to the dealership and they gave her the battery went bad due to lack of use story.

They're taking it back today because it wouldn't start again last week and needed to be jumped. Now the dealership told them it may be a sensor or something that is causing the battery to drain.

Any ideas from you experts?

I would think there is a drain on the battery. It shouldn't go dead in 1 week. If the dealership doesn't find a problem, I would try another repair facility. I have vehicles that sit for months without running and they still start.

does it have handsfree link thingy? Thats a common problem on the acura side.

Being that it's still under warranty, keep taking it in. They will fix the problem. Call the regional rep if need be. It's retarded to take a vehicle still under warrantyto Joe-Blow repair shop that likely couldn't fix his wa out of a wet papaer bag. Let the factory fix it for free.

It does not have the handsfree thingy.

They are taking it to a Honda dealer for all repairs. It's not going to a Joe Blow repair shop.

The Honda dealer couldn't find any problem again.

They did tell my parents that they should be locking the car with the remote key fob instead of actually pushing the lever on the door to lock the car. They said locking it internally leaves some systems on for at least 30 minutes. Is that even true? It seems far fetched to me. They always lock it with the key fob so that couldn't be the source of the drain.

I think it's time for a real tech to do a current draw test. Easy, just put an ammeter in line with the positive battery lead. With everything turned off, no current draw. If meter shows amps, problem. Disconnect everything until problem is isolated. Not quite that easy in reality, but close enough.