I know this sounds stupid but I received my 890 Remote the other day and assumed the battery was already in it (but dead) and put it in the charger. The device lit up once in the base so I assumed it was charging. The next day, it was dead. Finally realized that there was not battery in it and went and pulled it out of the packaging. Needless to say my problem was fixed.

Is it possible you simply haven't put the battery in?