Bob,
It could be that the battery, and not the charger is bad. The meter in most cases is pretty useless. In this case, however, it could indicate the inability of the battery to be able to accept a full charge. I would agree that the battery going bad in a about a year is an unusual occurance.
I guess the first thing I'd do to put some regular batteries in to make sure the remote itself isn't the problem (very unlikely). Replacing the battery is pretty expensive, best bet might be ebay, a charger with battery is probably cheaper than just buying a new battery.
Jim L