LAST EDITED ON Feb-08-01 AT 04:22 PM (GMT)The battery should be a CR2032. Make sure it is properly installed and + is up. If you have a multimeter or you have a friend who has a multimeter, remove the battery and check the voltage. It should read 3.0 volts when fully charged. If it reads 1.8 volts or higher it is probably OK. Be very careful installing and removing coin-shaped batteries. Most of the battery holders I have seen for these batteries are quite fragile and easily broken. I ease these batteries into the holder with the aid of a “tweaker” (small screw driver). Larry