I have an Apelco GXL 1100 GPS that is about 12 years old and it still works though I haven't used it in years. I think the lithium battery is dead and would like to replace it. The battery is about the size of an old nickel and is attached to a circuit board with what looks like some kind of adhesive. I have never replaced one of these and the manual states that this should be done only by a dealer.<br /><br />This may be a good excuse to get a new unit but that goes against my grain. Anybody replaced one of these & can offer any tips?