Generally there are three possibilities (apart from the
battery going bad) that can cause your remote not to charge:
1) Some folks have reported that the
battery is not sitting tightly enough in the battery compartment. You can try folding a small piece of thin cardboard and place it between the battery and the back of the compartment. This will push the battery towards the front of the compartment and create a tighter
connection against the contacts.
2) There have been reports of problems with some of the charging cradles in which the remote does not make sufficient contact with the contacts in the cradle. To ensure that the remote begins to charge, place it in the cradle and listen for a single beep. The
slide show should start and then, after a few moments the screen should darken. If you hear two beeps at any time, it means that the remote has lost contact with the charging cradle and has 'woken' and is no longer in charging mode. Wiggle the remote to ensure that it is sitting in the cradle and making contact.
3) If you still have trouble after you have tried everything above, there may be a loose
connection inside the remote itself. There is a very small plug that connects the charging terminals on the remote to the battery compartment. In some cases, this plug can become loose (especially if the remote has been dropped). Opening the remote and checking to make sure that the plug is completely seated is another thing to check if all else fails.