EvanM

Just got off the phone with Lego. They are aware of the problem and, as far as they are concerned, the problem is with positive post on Duracell batteries. They claim it is shorter than any other brand they tested. It is my opinion the problem is Lego's connector, for that battery position, is shorter than the other two... But I wasn't about to try to convince the poor guy working the phones the Saturday after Christmas.

To clarify the issue. Here's some pics of our remotes.

We just got the 42030 Volvo front loader for Christmas and we too have problems with both remotes. We found the source of the problem here: http://bricks.stackexchange.com/questions/4870/lego-remote-controlled-cargo-train-not-working , and confirmed it with our remotes. The (+) connector for the right-most battery is not as 'tall' as the others and just barely doesn't touch the battery. That figured out... I'm not sure what to do other than call Lego tomorrow.